Abu Salama asked 'A'isha about the two prostrations (i. e. rak'ahs) which the Messenger of Allah (ﷺ) made after the 'Asr. She said:
He (the Holy Prophet) observed them before the 'Asr prayer, but then he was hindered to do so, or he forgot them and then he observed them after the 'Asr, and then he continued observing them. (It was his habit) that when he (the Holy Prophet) observed prayer, he then continued observing it. Isma'il said: It implies that he always did that.
Reference: Sahih Muslim 835 a In-book : Book 6, Hadith 362 USC-MSA web (English) : Book 4, Hadith 1816 (deprecated)
Help us gift a modern, ad-free Islamic application for the Muslim Ummah. Your donation will be recorded as Sadaqah Jariyah in your book of deeds, In Sha Allah.