Musannaf Ibn Abi Shaybah 14584 — Praying Maghrib before Muzdalifah

Umar bin Abd al-Aziz was standing at Arafah, saying: O people, you have come from near and far, and you are not one single delegation. The one who is ahead is not the one whose mount and camel carried him ahead; rather, the one who is ahead is the one whose sins Allah Almighty has forgiven. A man called out loudly: Where should we offer the Maghrib prayer? He said: In whichever valley the time of Maghrib reaches you, offer it there.