Chapter 8: The Book of the Masjids
It was narrated from Abu Salamah bin 'Abdur-Rahman and Abu 'Abdullah Al-Agharr, the freed slave of the Juhanis - better of whom were companions of Abu Hurairah - that they heard Abu Hurairah say: "One prayer in the Masjid of the Messenger of Allah (ﷺ) is better than one thousand prayers offered in other mosques, except Al-Masjid Al-Haram, for the Messenger of Allah (ﷺ) was the last of the prophets and his Masjid was the last of the Masjids." Abu Salamah and Abu 'Abdullah said: "We do not doubt that Abu Hurairah was speaking on the basis of the Hadith of the Messenger of Allah (ﷺ), but we could not verify that Hadith with Abu Hurairah before he died. Then we remembered that and we blamed one another for not having spoken to Abu Hurairah about that, so that he could attribute it to the Messenger of Allah (ﷺ) if he had indeed heard it from him. While we were arguing, we went and sat down with 'Abdullah bin Ibrahim bin Qariz, and we told him about the Hadith and how we had been negligent in not checking it with Abu Hurairah. 'Abdullah bin Ibrahim said to us: 'I bear witness that I heard Abu Hurairah say: The Messenger of Allah (ﷺ) said: I am the last of the prophets and it is the last of the Masjids.'"
Sunan an-Nasa'i 694