How would I find the players team to make anti tk?

I tried multiple times but failed

This is the function that detects for a hit (also this gun uses ray casting).

The main point of this question is to find out how to make anti team kill in this function.

local function hit(plr, part)
	if not canShoot() then return end
	if not part then return end
	
	local character = player.Character or player.CharacterAdded:Wait()
	local rootPart = character:WaitForChild("HumanoidRootPart")
	
	if rootPart then
		if (rootPart.CFrame.p - part.CFrame.p).magnitude <= range.Value then
			local humanoid
			
			if part.Name == "Handle" then
				humanoid = part.Parent.Parent:FindFirstChild("Humanoid") 	
			else
				humanoid = part.Parent:FindFirstChild("Humanoid")
			end
			
			
			if humanoid and humanoid.Health > 0 then
				local newDamage = damage.Value
				
				if part.Name == "Head" then
					newDamage = newDamage * headMultiplier.Value
					
					local soundCopy = headshotSound:Clone()
					soundCopy.Parent = part
					soundCopy:Play()
				end
				
				humanoid:TakeDamage(newDamage)
			end
		end
	end
end

Given the character you can use:

local player = game.Players:GetPlayerFromCharacter(character)

then you can just use the player's team color to detect if they are on the team that you're checking for.

local player = game.Players:GetPlayerFromCharacter(character)
if player.TeamColor == whateverTeam'sTeamColor then
--don't do damage
else
--do damage!
end

The Players service has a function, which is GetPlayerFromCharacter.

It expects an instance as an argument, and if it is a player's character, the player is returned and now you have the player. It will return nil if the instance is not a character.

local targetplayer = game.Players:GetPlayerFromCharacter(part.Parent)

if not targetplayer then
    -- Maybe hit an accessory
    targetplayer = game.Players:GetPlayerFromCharacter(part.Parent.Parent)
end

if targetplayer and targetplayer.TeamColor ~= player.TeamColor then
    -- Do stuff
end