Musannaf Ibn Abi Shayba 3:5857

Abdah narrated to us, from Asim, from Abu Uthman, who said: I went out with Sa’d to Makkah. He used to combine the two prayers, between Dhuhr and Asr; he would delay the former and hasten the latter, and pray them both together. And he would delay Maghrib and hasten Isha, then pray them both together, until we arrived in Makkah.