Muhammad heard from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Jibril (peace be upon him) came and led me in the prayers at two times, except for Maghrib. He came to me at Maghrib and led me in prayer at the moment the sun set; then on the second day he came to me at Maghrib and led me in prayer at the moment the sun set; he did not change it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1723