Detect alignment

You  detect  the aligment of a humanoid you can see within range. You know if it shares your aligment or not, the creature is not aware of this effects unless it is protected against Divination. You can force it to do a Charisma saving throw to know its exact aligment, the creature will know of your probing if the creature succeeds on the Save

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can target one additional creature for each slot level above 4th. The creatures must be within 30 feet of each other when you target them.