Mukhtasar Muslim (Abridged) 438 — Combining two prayers during travel

It is narrated from Sayyiduna Anas bin Malik, may Allah be pleased with him, that when the Prophet Muhammad, peace and blessings be upon him, was in a hurry during a journey, he would delay Zuhr until the beginning time of Asr arrived, then combine both. And he would delay Maghrib until when the twilight disappeared, he would combine it with Isha.