why won't the sound play when in my tool?

I made a axe and when I go to click it plays the animation and I have it set to where a sound will play when the animation occurs but nothing happens...

heres my script

function hit()
	UnsheathSound:play() -- need help here
	local anim = Instance.new("StringValue")
	anim.Name = "toolanim"
	anim.Value = "Slash"
	anim.Parent = Tool
end

Where did you get the UnsheathSound?? Make a variable for example :

sound = game.Workspace.UnsheathSound