Musnad Abu Ya'la al-Mawsili 148:16

Abu al-Rabi' al-Zahrani narrated to us, 'Abd al-Hakim bin Mansur narrated to us, Ziyad bin Abi Hassan narrated to us, he said: I heard Anas bin Malik say: The Messenger of Allah (ﷺ) said: "Whoever aids a distressed person, Allah writes for him seventy-three good deeds; one of them is that by which Allah rectifies for him the affair of his worldly life and his Hereafter, and seventy-two of them are degrees."