Musnad Ahmad Hadith 21749

It is narrated from Usama bin Zaid (may Allah be pleased with him) that on the return from Arafat, the Noble Prophet (ﷺ) seated him behind himself. When they reached the valley, the Noble Prophet (ﷺ) dismounted and urinated—the narrator did not use the expression "poured water." Then I poured water over him and he performed a light ablution. I said, "O Messenger of Allah! The time for prayer has come." The Noble Prophet (ﷺ) said, "The prayer is ahead of you." Then he mounted his ride and reached Muzdalifah, where he performed the Maghrib prayer. Then the people made their mounts sit at their respective places, and they had not yet unpacked their belongings when the Isha prayer was established.