Abu Salamah (may Allah have mercy on him) said: I saw Sayyiduna Abu Hurayrah (may Allah be pleased with him) recite Surah al-Inshiqaq, and he prostrated in it. I said: O Abu Hurayrah, did I not see you prostrate? He said: Had I not seen the Messenger of Allah (peace and blessings be upon him) prostrate in it, I would never have done so.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3718