Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
What is meant is conversation which is permitted at other than this and doing it or not doing is the same. As for talk which is forbidden or disliked at other times, it is even more strongly forbidden and disliked at this time. As for talking about good, like discussing knowledge, stories of the righteous, noble character, talking with a guest, talking with someone who has a need and the like, that is not disliked. Indeed it is recommended. It is the same for talk which is due to an excuse or event: it is not disliked. Sound hadiths support all that we mentioned.
1747. Ibn 'Umar reported that once, towards the end of his life, the Messenger of Allah, may Allah bless him and grant him peace, prayed 'Isha' and said, "Do you see this night? No one on the surface of the earth will still be there in a hundred years from now." [Agreed upon]
1748. Anas said, "The Prophet, may Allah bless him and grant him peace, delayed the 'Isha' prayer until the middle of the night and then led them in the prayer. Then he addressed us and said, 'Most people have prayed and gone to sleep, but you were in prayer the whole time you were waiting for it.'" [al-Bukhari]