Musnad Ahmad 5:711

Abdullah narrated to us, Muhammad ibn Bakkar narrated to me, Hafs ibn Sulayman—meaning Abu Amr al-Qari—narrated to us, from Kathir ibn Zadhan, from Asim ibn Damrah, from Ali ibn Abi Talib, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever learns the Quran, masters it, and memorizes it, Allah will admit him into Paradise and grant him the right of intercession for ten of his family members, all of whom the Fire had already become due for."