Sayyiduna Imran bin Husayn (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) led three rak‘ahs of the ‘Asr prayer and then said the salam. He was informed about it, so he led one more rak‘ah, then after saying the salam, he performed two prostrations and then said the salam again.
Hadith Referenceالمنتقى ابن الجارود / كتاب الصلاة / 245
Hadith Gradingغلام مصطفےٰ ظهير امن پوري:صحيح
Hadith Takhrijاز غلام مصطفےٰ ظهير امن پوري:«صحيح مسلم : 574»