And from him, from Ahmad ibn Muhammad ibn Musa from Yaqub ibn Yazid from Hammad ibn Isa from Hariz from Zurarah from Abu Abdillah عليه السلام, peace be upon him, who said: I (Zurarah) asked: “(If) I caught the imam (of prayer) while he was delivering the sermon.” Imam عليه السلام said: “You sit until he (imam of prayer)) finishes his sermon, then you stand and pray.” I asked: “Should I begin with making up the prayer (qadah) or start with my own prayer?” Imam عليه السلام said: “No, rather start with your own prayer and this ruling applies only in this prayer.” I asked: “Then what if I catch part of the obligatory prayer with the imam (of prayer) and then complete the rest afterward?” Imam عليه السلام said: “As for what you catch from the obligatory prayer, it is the beginning of your prayer, and what you make up is its end.”