Was my first Nazareth album, so I'm quite intimate with it
Actually the version you put above comes as a bonus track in "The Fool Circle". The sampler you want is from "Snaz" and starts at the end of track 7 ('Java Blues'), and goes (roughly):
Hey listen, do you guys sing?
Can the rest of you guys sing?
All I want you to do, is sing one word for me now.
*whistles*
And the word is...shhhh, the word is cocaine.
*screams*
What's the word?
*COCAINE*
You've got the job.