Musnad Abu Ya'la al-Mawsili 209:150

Abu Khaythama narrated to us, Yazid bin Harun narrated to us, Hammad bin Salama narrated to us, from al-Azraq bin Qays, from Dhakwan, from Umm Salama, who said: The Messenger of Allah (ﷺ) prayed the Asr prayer, then he entered 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." He said: "Some wealth arrived to me, and it distracted me from two rak'ahs that I used to pray after the Dhuhr prayer, so I prayed them now." I said: "O Messenger of Allah, should we make them up if we miss them?" He said: "No."