Sahih al-Bukhari Book 9, Hadith 42
We asked Jabir bin `Abdullah about the prayers of the Prophet (ﷺ) . He said, "He used to pray Zuhr prayer
at midday, the `Asr when the sun was still hot, and the Maghrib after sunset (at its stated time). The
`Isha was offered early if the people gathered, and used to be delayed if their number was less; and the
morning prayer was offered when it was still dark. "
"One night Allah's Messenger (ﷺ) led us in the `Isha' prayer and that is the one called Al-`Atma by the people. After the completion of the prayer, he faced us and said, "Do you know the importance of this night? Nobody present on the surface of the earth tonight will be living after one hundred years from this night." (See Hadith No. 575).
Allah's Messenger (ﷺ) once delayed the `Isha' prayer and that was during the days when Islam still had not spread. The Prophet (ﷺ) did not come out till `Umar informed him that the women and children had slept. Then he came out and said to the people of the mosque: "None amongst the dwellers of the earth has been waiting for it (`Isha prayer) except you."