Musnad Ahmad 26:472

'Abd al-Razzaq narrated to us, Ma'mar informed us, from Abu Ishaq, from Abu al-Ahwas, from Ibn Mas'ud, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Indeed, the servant continues to lie until he is recorded with Allah as a liar, or he continues to be truthful until he is recorded with Allah as a truthful one (siddiq)."