مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3996
Musnad of Abdullah bin Mas'ood
It was narrated that Ibn Mas'ood said: I heard the Messenger of Allah (ﷺ) say: "A person may tell lies until he is recorded with Allah as a liar, or he may speak the truth until he is recorded with Allah as a speaker of truth.”
Musnad Ahmad 4022A saheeh hadeeth]