Hadith.1001 – Zurarah narrated from Imam Muhammad ibn Ali Al-Baqir عليه السلام who said: "I asked about a man who forgot the first Takbir of the prayer (Takbir al-Ihram). Imam عليه السلام said: 'If he remembers it before the bowing (ruku'), he should say the Takbir, then recite, and then perform the ruku'. If he remembers it during the prayer, he should say the Takbir at the place of the Takbir, whether before or after the recitation.' I asked: 'What if he remembers it after the prayer?' Imam عليه السلام said: 'Then he should make it up, and there is nothing wrong with him.'"