Sunan Ibn Majah, 1210

It was narrated that Abu Sa’eed Al-Khudri said:“The Messenger of Allah (ﷺ) said: ‘If anyone of you is uncertain about his prayer, let him put aside uncertainty and act upon that which is certain. When he has made sure his prayer is complete, then let him prostrate twice. Then if his prayer was complete, that (extra) Rak’ah will be counted as voluntary, and if his prayer was lacking, that Rak’ah will complete his prayer, and the two prostrations will rub the Satan’s nose in the dust.’”

Rapporté par Abu Sa’eed Al-Khudri : Le Messager d’Allah (ﷺ) a dit : “Si l’un de vous a un doute sur sa prière, qu’il laisse de côté le doute et qu’il se base sur ce qui est sûr. Une fois qu’il a terminé sa prière, qu’il fasse deux prosternations. Si sa prière était complète, cette Rak‘a supplémentaire sera comptée comme surérogatoire, et si sa prière était incomplète, cette Rak‘a complétera sa prière, et les deux prosternations humilieront le diable.”