Sahih al-Bukhari 6667

Ishaq ibn Mansur narrated to me; Abu Usamah narrated to us; Ubaydullah ibn Umar narrated to us, from Sa'id ibn Abi Sa'id, from Abu Hurayrah, that a man entered the mosque and prayed while the Messenger of Allah, peace and blessings be upon him, was in one corner of the mosque. The man came and greeted him. He said, ‘Go back and pray, for you have not prayed.’ The man went back and prayed, then greeted him again. He said, ‘And upon you be peace. Go back and pray, for you have not prayed.’ On the third time, the man said, ‘Teach me.’ He replied: ‘When you stand for prayer, perform ablution thoroughly, then face the qiblah and say the opening takbir. Recite whatever you can from the Quran. Then bow until you are at ease in bowing. Raise your head until you are standing upright. Then prostrate until you are at ease in prostration. Raise yourself until you are sitting upright and at ease. Then prostrate until you are at ease in prostration. Then rise until you are standing upright. Do this throughout your prayer.’