Musnad Ahmad

Muhammad bin Amr says that once pilgrims came to Madinah Munawwarah. We asked Sayyiduna Jabir (may Allah be pleased with him) about the timings of the prayers: he informed us that the Prophet (peace and blessings be upon him) used to perform the Zuhr prayer at midday, the Asr prayer when the sun was still shining, the Maghrib prayer when the sun had set, and the Isha prayer sometimes early and sometimes late. When he saw that the people had gathered, he would perform it early, and when he saw that the people had not yet arrived, he would delay it. And he used to perform the Fajr prayer when it was still dark.