"The Messenger of Allah said: 'Whoever hears the Adhan when he is in the mosque, then goes out and does not go out for any (legitimate) need and does not intend to return, is a hypocrite.'"
Sunan Ibn Majah Book 3, Hadith 29
← Previous Hadith "We were sitting in the mosque with Abu Hurairah when the Mu'adh-dhin called the Adhan. A man got up and walked out of the mosque, and Abu Hurairah followed him with his gaze until he left the mosque. Then Abu Hurairah said: "This man has disobeyed Abul-Qasim.'"

Sunan Ibn Majah Book 3, Hadith 28 Next Hadith → "I heard the Messenger of Allah say: 'Whoever builds a mosque in which the Name of Allah is mentioned, Allah will build a house for him in Paradise.'"

Sunan Ibn Majah Book 4, Hadith 1