Hadith 1245
It is narrated from Sayyiduna Nu’man bin Bashir (may Allah be pleased with them both) that I have the most knowledge among the people about the time of this prayer (i.e., the time of the ‘Isha prayer). The Messenger of Allah (peace and blessings be upon him) used to offer (the ‘Isha prayer) at the time when the third night’s moon would set. Yahya said: Imam Darimi (may Allah have mercy on him) dictated this narration in his book through the route of Bashir bin Thabit.