that the Messenger of Allah (ﷺ) said: "When you see a man frequenting the Masjid, then testify to his faith. Indeed Allah, Most High, said: The Masjid shall be maintained by those who believe in Allah and the Last day (9:18)."

(Another chain) from Abu Sa'eed from the Prophet (ﷺ) with similar wording except that he said: "Yata'ahadul Masjid."
Jami` at-Tirmidhi Book 47, Hadith 145
← Previous Hadith "We asked 'Ali what he had been dispatched with during the Hajj. He said: 'I was sent with four: That there shall be no Tawaf around the House while naked, that if there is a treaty between someone and the Prophet (ﷺ), then the treaty remains until its expiration, and whoever does not have a treaty, then he has the span of four months, none shall enter Paradise except a believer, and the idolaters and Muslims shall not congregate (for Hajj) after this year.'"

bin 'Uyainah from Abu Ishaq. Sufyan Ath-Thawri reported it from Abu Ishaq, from some of his companions, from 'Ali, and there is something about it from Abü Hurairah.

(Another chain) from Zaid bin Yuthai' from 'Ali with similar wordings.

(Another chain) Zaid bin Uthal' from 'Ali with similar wordings.

.

Jami` at-Tirmidhi Book 47, Hadith 144 Next Hadith → "When (the following) was revealed: And those who hoard up gold and silver... (9:34)" He said: "We were with the Messenger of Allah (ﷺ) during one of his journeys, so some of his Companions said: (This) has been revealed about gold and silver, if we knew which wealth was better then we would use it. So he (ﷺ) said: 'The most virtuous of it is a remembering tongue, a grateful heart, and a believing wife that helps him with his faith.'"

Jami` at-Tirmidhi Book 47, Hadith 146