It wasnarrated that 'Abdullah bin Harith said:
"Mu'awiyah sent wordto Umm Salamah, and I went with his envoy who put the question to UmmSalamah. She said: 'While the Messenger of Allah (ﷺ) wasperformingablution for the Zuhr in my house and he had sent a Sa'i,*theMuhajirun gathered around him in large numbers, and he was busydealing with them. When a knock on the door came, he went out andperformed the Zuhr, then he sat and distributed what had been broughtto him.' She said: 'He continued doing that until the 'Asr.Then hecame into my house and performed two Rak'ah. Then he said:"The matterof the Sa'i kept me from praying them after Zuhr, soI prayed themafter 'Asr."
English reference: Vol. 1, Book 5, Hadith 1159
Arabic reference: Book 5, Hadith 1214