how do i stop a function from running?

I only learned about an interesting method that solves your problem around half a month ago; the disconnect() method! It does exactly what you'd expect: it disconnects the connection from an event. In order to do so, you must give your event a variable name. Here, I'll show you how yours should look:

local thisEvent = script.Parent.BladePart.Touched:connect(function(hit)
	print(hit.Parent.Name)
end)

Now say you want to disconnect that event named "thisEvent". Simply use this line of code:

thisEvent:disconnect()

This will effectively severe the event listener.

Note: you can also do this like so:

function hitFunc()
	print(hit.Parent.Name)
end

local thisEvent = script.Parent.BladePart.Touched:connect(hitFunc)

--Somewhere else:
thisEvent:disconnect()

Hoped this helped! If you need any other help, just ask! :)

Here is the wiki page for Connections/disconnect(): RBXScriptSignal