مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1417
The Musnad of az-Zubair bin al-'Awwam
It was narrated that az-Zubair (رضي الله عنه) said: I heard the Messenger of Allah (ﷺ) say one day: "Paradise is due to Talhah," when he did what he did for the Messenger of Allah (ﷺ)(i.e., when Talhah leaned down and the Messenger of Allah (ﷺ) climbed on his back.)
Musnad Ahmad 1417Hasan (Darussalam)]