From Sahih Bukhari (Hadith 1078):
Narrated Abu Rafi`:I offered the `Isha' prayer behind Abu Huraira and he recited Idhas-Sama' Un-Shaqqat, and prostrated. I said, "What is this?" Abu Huraira said, "I prostrated behind Abul-Qasim and I will do the same till I meet him
Reference: Bukhari 1078