How do I make the player's arm face towards the mouse?

This is kind of hard to explain, but I am trying to make the player's (character's) arm face toward the mouse.

I've tried this using CFrame but the character just glitches out and vibrates strangely...

This is what I've tried so far but nothing I wanted.

arm.CFrame = CFrame.new(arm.Position, Vector3.new(mouse.Hit.p.X, 0, mouse.Hit.p.Z))

Hmm... Try the following in a script

game.Players.PlayerAdded:connect(function(player)
	repeat wait() until player.Character
	local Mouse = player:GetMouse()
	local arm = --You have to define the arm variable.
	
	arm.CFrame = CFrame.new(arm.Position, Vector3.new(Mouse.Hit.X, 0, Mouse.Hit.Z))
end)

If this works, please mark as the solution!

As always, good scripting!