Sunan at-Tirmidhi (Jami-al-Tirmidhi), Chapter: Salah (Prayers)

that when Allah's Messenger (SAW) entered the mosque, another person also entered it and he offered salah. Then, he came and greeted the Prophet (SAW). He responded to his salam and said, 'Go back and repeat your prayer, for, you have not offered it.' He went back and repeated the salah in the same way as he had offered before. He then came to the Prophet (SAW) and greeted him with salaam. He gave the response and said to him, "Go offer the salah. You have not prayed." This happened three times. This man submitted, "By Him Who has sent you with the true religion, I cannot offer prayer better than this. Do teach me!" So, the Prophet (SAW) said, 'When you stand for salah, call the takbir (which is takbir tahrimah). Then recite from the Qur'an whatever you remember. Then make the ruku peacefully. Get up and stand straight. Then make the sajdah in a peaceful manner. Get up and sit composedly. Do this throughout in your salah.' [Ahmed 9641, Bukhari 757, Muslim 397, Nisai 884, Abu Dawud 856, Ibn e Majah 1060]