Does the latecomer count the extra rak'ah the imam added by mistake?
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The Shaykh : If someone were to say: Did not the Prophet (peace and blessings be upon him) say: Bulugh al-Maram 2:329?
We say: Yes, he said it that way, but his saying "then make up" or "then complete" indicates that the follower still has something remaining. The follower now has completed what remained for him. This is the stronger position, the correct one, and the definitive one, and it is the position to which our Shaykh, Abd al-Rahman ibn Sa'di (may Allah have mercy on him), adhered. Yes.
If you hear the Iqamah, you must walk to the prayer (place) with tranquility and dignity, and do not hasten; and whatever portion of the prayer you get (along with the Imam) offer it, and complete afterwards whatever you missed.
إذا سمعتم الإقامة فامشوا إلى الصّلاة وعليكم السّكينة والوقار ولا تسرعوا فما أدركتم فصلّوا وما فاتكم فأتمّوا -أو قال- فاقضواWe say: Yes, he said it that way, but his saying "then make up" or "then complete" indicates that the follower still has something remaining. The follower now has completed what remained for him. This is the stronger position, the correct one, and the definitive one, and it is the position to which our Shaykh, Abd al-Rahman ibn Sa'di (may Allah have mercy on him), adhered. Yes.