Sayyidah Umm Salamah (may Allah be pleased with her) narrates: The Prophet (peace and blessings be upon him) prayed the Asr prayer, then he came into my house and prayed two rak'ahs. I said: "O Messenger of Allah! You have prayed a prayer that you did not use to pray before." The Prophet (peace and blessings be upon him) said: "Some wealth came to me, and it kept me from the two rak'ahs I used to pray after Zuhr, so I have prayed them now." I said: "O Messenger of Allah! When they are missed, do you make them up?" The Prophet (peace and blessings be upon him) said: "No."
(Allamah al-Haythami says:) I say: This report is also in the Sahih, except for her words: "When they are missed, do you make them up?" and the Prophet's (peace and blessings be upon him) saying: "No."
Ahmad and Ibn Hibban (may Allah have mercy on him) in his Sahih recorded it, and Ahmad's narrators are the narrators of the Sahih.