Sahih Bukhari

Narrated Abu Rafi`:I offered the `Isha' prayer behind Abu Huraira and he recited, ""Idha s-samaa'u n-shaqqat"" (84) and prostrated. On my inquiring, he said, ""I prostrated behind Abul-Qasim (the Prophet) (when he recited that Sura) and I will go on doing it till I meet him