https://www.youtube.com/watch?v=OTn01jjEFfY

https://www.youtube.com/watch?v=IhHBr7nMMio

You might reasonably assume (as I did for years) that the Jamaican fellows lifted the riff and made a new song out of it as they've done a million times...
And also that a bunch of white studio cats in middle-of-nowhere 1969 Alabama wouldn't have been hip to a Jamaican single that never charted in US...
... and you would be wrong, friend.

(And apparently Harry J stole it too...)