Raekwon - Glaciers of Ice samples
The Charmels 'Please Uncle Sam (Send Back My Man)'.
http://www.youtube.com/watch?v=mBIvWpjyNy4 (appears approx 20 secs in)
Funny about this epic sample is that, according to wikipedia, this song was sampled for ice cream, which is obviously incorrect. Maybe someone got the songs mixed up and never reached the public. However, this is the mythological sample for Glaciers of ice, i have even played around with it in my sampler and its even the right tune, so its a definite match.
Cilva claimed that 'glaciers' and 'it was written' sample the same song, which i cant confirm as of now.