مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4061
Musnad of Abdullah bin Mas'ood
It was narrated that ‘Abdullah (رضي الله عنه) said: A Jew came to the Prophet (ﷺ) and said: O Muhammad, verily Allah will carry the heavens on one finger, and the earths on one finger, and the mountains on one finger, and all living beings on one finger, and the trees on one finger, then He will say: I am the Sovereign. The Prophet (ﷺ) smiled so broadly that his molars could be seen, and said: "They made not a just estimate of Allah such as is due to Him…” (az-Zumar 39:67). Yahya said: And Fudail - meaning bin 'Iyad - said: In amazement and confirmation.
Musnad Ahmad 4087Its isnad is saheeh, al-Bukhari (7414)]