Musnad Ahmad 482:48

Yazid ibn Harun narrated to us, Ismail—meaning Ibn Abi Khalid—informed us, from Abd al-Rahman ibn A’idh, a man from the people of Ash-Sham, who said: Uqbah ibn Amir al-Juhani set out to Al-Aqsa Mosque to pray in it, and some people followed him. He said: "What brought you?" They said: "Your companionship with the Messenger of Allah, peace and blessings of Allah be upon him; we loved to walk with you and greet you." He said: "Dismount and pray." So they dismounted, and he prayed, and they prayed with him. When he finished the prayer, he said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: "There is no servant who meets Allah, not associating anything with Him, and not having been stained with forbidden blood, except that he will enter from whichever of the gates of Paradise he wishes."