It is narrated from Abu Rafi' (may Allah have mercy on him): I saw Abu Hurayrah (may Allah be pleased with him) prostrate in Surah al-Inshiqaq. I said: Do you prostrate in it? He replied, and then the narrator mentioned the report given above. Shu'bah (may Allah have mercy on him) said: I asked Abu Rafi' (may Allah have mercy on him): From the Prophet (peace and blessings be upon him)? He said: Yes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3721