Hadithcore
Musnad Ahmad 1800
sahih· Darussalam

Hakam - i.e., Ibn Aban – narrated: I heard ‘Ikrimah say: al-Fadl bin ‘Abbas said:

When the Messenger of Allah (ﷺ) moved on, I was with him. We reached the mountain pass and he dismounted and did wudoo’, then we rode on until we came to Muzdalifah.

References1 variant
Arabic/English book
Book 22, Hadith 1800