Musnad Abu Ya'la al-Mawsili 105:27

'Umar ibn al-Khattab narrated to us, 'Abd al-Malik ibn Ibrahim al-Jaddi narrated to us, Sufyan narrated to us, from Ibn 'Ajlan, from Sa'id ibn Abi Sa'id, that 'Ammar prayed, and a man said to him, "You have made the prayer light, O Abu al-Yaqzan." He said, "Did you see me omit anything from its limits? I witnessed the Messenger of Allah (ﷺ) saying: 'Indeed, a man may pray, then depart, and there is not written for him except half of it, a third of it, a fourth of it, a fifth of it, a sixth of it, an eighth of it, a ninth of it, or a tenth of it.'"