It is narrated from Sayyiduna Abu Malik al-Ash'ari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) prayed, and when he bowed he said "Subhan Allahi wa bihamdihi (Glory be to Allah and praise be to Him)" three times, then he raised his head.
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3409