Musnad Abu Ya'la al-Mawsili 160:182

Al-Abbas ibn al-Walid al-Narsi narrated to us, Yahya ibn Sa’id narrated to us, from Ubaydullah ibn Umar, from Sa’id ibn Abi Sa’id, from his father, from Abu Hurairah, that the Messenger of Allah (may Allah bless him and grant him peace) entered the mosque. A man entered and prayed as he (the Prophet) prayed, then he came to the Prophet (may Allah bless him and grant him peace) and greeted him. The Messenger of Allah (may Allah bless him and grant him peace) returned the greeting to him and said, "Go back and pray, for you have not prayed." He did that three times. The man said, "By the One who sent you with the truth, I do not know any better than this, so teach me." He said, "When you stand for prayer, say the takbir (Allahu Akbar), then recite what is easy for you from the Quran. Then bow until you are at ease while bowing, then rise until you are standing upright, then prostrate until you are at ease while prostrating, then rise until you are at ease while sitting. Then do that in all of your prayer."