Muhammad ibn Ya‘qub narrated from Ali ibn Ibrahim from his father from Ibn Abi Umayr from Ibn Udhayna from Fudayl ibn Yasar from Abu Abdillah عليه السلام. Imam عليه السلام said: “The obligatory and recommended prayers are fifty-one rak‘ahs, among them two rak‘ahs after the ‘Atamah (night prayer) while sitting, which are counted as one rak‘ah when performed standing. The obligatory among them are seventeen rak‘ahs, and the recommended are thirty-four rak‘ahs.”