Track name: I Desire
Original release: LP, "Hot Cool & Vicious"
Label: Next Plateau
Cat number: PL-1007
Producer: Herby "Luv Bug" Azor
Source break: Amen Brother
Hellrazor - I Feel So High
2 Sinister - Let It Roll
I'd found this on tape from some time back but couldn't identify which track it was (it was from 1989 and was mistakenly looking at the Salt With A Deadly Pepa album) but have just spotted it thanks to the Rap Sample FAQ. This is a second generation amen derivative and is used most distinctively by Hellrazor - I Feel So High (provides the entire cadence for the track!), but have more recently noticed it used by the Dark Horse track also.
Listening closer, it sounds like the loop takes the first two beats of Run DMC "Walk This Way" to give that hard kick/snare drop at the beginning and then overlays some 808 snares across the rest.
Being from 1986 this is probably one of the first tunes to actually use a sampled looped break as its basis, prior to that hip hop tunes would either 'replay' the break in full or have the DJ scratch in the break over the chorus (have a look at Run DMC "Peter Piper" for example). The only other one I can think of earlier is Ultra Magnetic MCs "Ego Trippin'"... hmmm interestingly that appeared on Next Plateau also...