diff --git a/src/command/Command.php b/src/command/Command.php
index 341883fdd..fa792fdb1 100644
--- a/src/command/Command.php
+++ b/src/command/Command.php
@@ -111,27 +111,28 @@ abstract class Command{
 		$this->permission = $permission;
 	}
 
-	public function testPermission(CommandSender $target) : bool{
-		if($this->testPermissionSilent($target)){
+	public function testPermission(CommandSender $target, ?string $permission = null) : bool{
+		if($this->testPermissionSilent($target, $permission)){
 			return true;
 		}
 
 		if($this->permissionMessage === null){
 			$target->sendMessage($target->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
 		}elseif($this->permissionMessage !== ""){
-			$target->sendMessage(str_replace("<permission>", $this->permission, $this->permissionMessage));
+			$target->sendMessage(str_replace("<permission>", $permission ?? $this->permission, $this->permissionMessage));
 		}
 
 		return false;
 	}
 
-	public function testPermissionSilent(CommandSender $target) : bool{
-		if($this->permission === null or $this->permission === ""){
+	public function testPermissionSilent(CommandSender $target, ?string $permission = null) : bool{
+		$permission ??= $this->permission;
+		if($permission === null or $permission === ""){
 			return true;
 		}
 
-		foreach(explode(";", $this->permission) as $permission){
-			if($target->hasPermission($permission)){
+		foreach(explode(";", $permission) as $p){
+			if($target->hasPermission($p)){
 				return true;
 			}
 		}
diff --git a/src/command/defaults/ClearCommand.php b/src/command/defaults/ClearCommand.php
index 96055d86f..bfa5623f7 100644
--- a/src/command/defaults/ClearCommand.php
+++ b/src/command/defaults/ClearCommand.php
@@ -64,13 +64,11 @@ class ClearCommand extends VanillaCommand{
 				$sender->sendMessage(new TranslationContainer(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PLAYER_NOTFOUND));
 				return true;
 			}
-			if($target !== $sender && !$sender->hasPermission(DefaultPermissionNames::COMMAND_CLEAR_OTHER)){
-				$sender->sendMessage($sender->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
+			if($target !== $sender && !$this->testPermission($sender, DefaultPermissionNames::COMMAND_CLEAR_OTHER)){
 				return true;
 			}
 		}elseif($sender instanceof Player){
-			if(!$sender->hasPermission(DefaultPermissionNames::COMMAND_CLEAR_SELF)){
-				$sender->sendMessage($sender->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
+			if(!$this->testPermission($sender, DefaultPermissionNames::COMMAND_CLEAR_SELF)){
 				return true;
 			}
 
diff --git a/src/command/defaults/KillCommand.php b/src/command/defaults/KillCommand.php
index d30ae3917..65b2386e6 100644
--- a/src/command/defaults/KillCommand.php
+++ b/src/command/defaults/KillCommand.php
@@ -57,9 +57,7 @@ class KillCommand extends VanillaCommand{
 		}
 
 		if(count($args) === 1){
-			if(!$sender->hasPermission(DefaultPermissionNames::COMMAND_KILL_OTHER)){
-				$sender->sendMessage($sender->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
-
+			if(!$this->testPermission($sender, DefaultPermissionNames::COMMAND_KILL_OTHER)){
 				return true;
 			}
 
@@ -76,9 +74,7 @@ class KillCommand extends VanillaCommand{
 		}
 
 		if($sender instanceof Player){
-			if(!$sender->hasPermission(DefaultPermissionNames::COMMAND_KILL_SELF)){
-				$sender->sendMessage($sender->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
-
+			if(!$this->testPermission($sender, DefaultPermissionNames::COMMAND_KILL_SELF)){
 				return true;
 			}
 
diff --git a/src/command/defaults/TimeCommand.php b/src/command/defaults/TimeCommand.php
index 7d8ad4e30..8a1bf2b9e 100644
--- a/src/command/defaults/TimeCommand.php
+++ b/src/command/defaults/TimeCommand.php
@@ -30,7 +30,6 @@ use pocketmine\lang\KnownTranslationKeys;
 use pocketmine\lang\TranslationContainer;
 use pocketmine\permission\DefaultPermissionNames;
 use pocketmine\player\Player;
-use pocketmine\utils\TextFormat;
 use pocketmine\world\World;
 use function count;
 use function implode;
@@ -61,9 +60,7 @@ class TimeCommand extends VanillaCommand{
 		}
 
 		if($args[0] === "start"){
-			if(!$sender->hasPermission(DefaultPermissionNames::COMMAND_TIME_START)){
-				$sender->sendMessage($sender->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
-
+			if(!$this->testPermission($sender, DefaultPermissionNames::COMMAND_TIME_START)){
 				return true;
 			}
 			foreach($sender->getServer()->getWorldManager()->getWorlds() as $world){
@@ -72,9 +69,7 @@ class TimeCommand extends VanillaCommand{
 			Command::broadcastCommandMessage($sender, "Restarted the time");
 			return true;
 		}elseif($args[0] === "stop"){
-			if(!$sender->hasPermission(DefaultPermissionNames::COMMAND_TIME_STOP)){
-				$sender->sendMessage($sender->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
-
+			if(!$this->testPermission($sender, DefaultPermissionNames::COMMAND_TIME_STOP)){
 				return true;
 			}
 			foreach($sender->getServer()->getWorldManager()->getWorlds() as $world){
@@ -83,9 +78,7 @@ class TimeCommand extends VanillaCommand{
 			Command::broadcastCommandMessage($sender, "Stopped the time");
 			return true;
 		}elseif($args[0] === "query"){
-			if(!$sender->hasPermission(DefaultPermissionNames::COMMAND_TIME_QUERY)){
-				$sender->sendMessage($sender->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
-
+			if(!$this->testPermission($sender, DefaultPermissionNames::COMMAND_TIME_QUERY)){
 				return true;
 			}
 			if($sender instanceof Player){
@@ -102,9 +95,7 @@ class TimeCommand extends VanillaCommand{
 		}
 
 		if($args[0] === "set"){
-			if(!$sender->hasPermission(DefaultPermissionNames::COMMAND_TIME_SET)){
-				$sender->sendMessage($sender->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
-
+			if(!$this->testPermission($sender, DefaultPermissionNames::COMMAND_TIME_SET)){
 				return true;
 			}
 
@@ -137,9 +128,7 @@ class TimeCommand extends VanillaCommand{
 			}
 			Command::broadcastCommandMessage($sender, new TranslationContainer(KnownTranslationKeys::COMMANDS_TIME_SET, [$value]));
 		}elseif($args[0] === "add"){
-			if(!$sender->hasPermission(DefaultPermissionNames::COMMAND_TIME_ADD)){
-				$sender->sendMessage($sender->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
-
+			if(!$this->testPermission($sender, DefaultPermissionNames::COMMAND_TIME_ADD)){
 				return true;
 			}
 
diff --git a/src/command/defaults/WhitelistCommand.php b/src/command/defaults/WhitelistCommand.php
index 0fddb59b3..d6f51185a 100644
--- a/src/command/defaults/WhitelistCommand.php
+++ b/src/command/defaults/WhitelistCommand.php
@@ -31,7 +31,6 @@ use pocketmine\lang\TranslationContainer;
 use pocketmine\permission\DefaultPermissionNames;
 use pocketmine\player\Player;
 use pocketmine\utils\AssumptionFailedError;
-use pocketmine\utils\TextFormat;
 use function count;
 use function implode;
 use function sort;
@@ -136,12 +135,6 @@ class WhitelistCommand extends VanillaCommand{
 		if($permission === null){
 			throw new AssumptionFailedError("Unknown subcommand $subcommand");
 		}
-		if(!$sender->hasPermission($permission)){
-			$sender->sendMessage($sender->getLanguage()->translateString(TextFormat::RED . "%" . KnownTranslationKeys::COMMANDS_GENERIC_PERMISSION));
-
-			return true;
-		}
-
-		return false;
+		return !$this->testPermission($sender, $permission);
 	}
 }