Imam Nafi’ says: When the redness disappeared, Sayyiduna Abdullah bin Umar (may Allah be pleased with him) would combine Maghrib and Isha prayers and say: When the Messenger of Allah (peace and blessings be upon him) was in a hurry to travel, he would combine these two prayers. In another narration it is stated: When the Prophet (peace and blessings be upon him) was in a hurry to travel until a quarter of the night had passed, he would delay these two prayers.
Hadith Referenceالفتح الربانی / أبواب صلاة السفر وآدابه وأذكاره وما يتعلق به / 2393