Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) said: A man asked about the times of prayer, and he (peace and blessings be upon him) said: "Pray with us." He then narrated the hadith, and in it is: Then he prayed Maghrib when the sun had set; and on the second day he said: "Then he prayed Maghrib before the redness of twilight disappeared."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1735