مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4068
Musnad of Abdullah bin Mas'ood
It was narrated that ‘Abdullah said: Verily Muhammad (ﷺ) told us that a man may tell lies until he is recorded with Allah as a liar, and a man may speak the truth until he is recorded with Allah as a speaker of truth.
Musnad Ahmad 4095Its isnad is saheeh, al-Bukhari (6094) and Muslim (2067)]