Abdullah bin Wahb عبد الله بن وهب بن مسلم القرشي · The Book of the Masjids

"Whoever prays in the Masjid of the Messenger of Allah (ﷺ) (that is good), for I heard the Messenger of Allah (ﷺ) say: ' One prayer offered there is better than a thousand prayers offered elsewhere, except the Masjid of the Ka'bah.'"

"While we were sitting in the Masjid. The Messenger of Allah (ﷺ) came out to us carrying Umamah bint Abi Al-'As bin Ar-Rabi', whose mother was Zainab, the daughter of the Messenger of Allah (ﷺ). She was a little girl and he was carrying her. The Messenger of Allah (ﷺ) prayed with her on his shoulder, putting her down when he bowed and picking her up again when he stood up, until he completed his prayer."

"I heard Abu Humaid and Abu Usaid say: 'The Messenger of Allah (ﷺ) said: "When any one of you enters the Masjid, let him say: 'Allahumma aftahli abwaba rahmatik (O Allah, open to me the gates of your mercy). And when he leaves let him say: Allahumma inni as'aluka min fadlik (O Allah, I ask You of Your bounty).'"