Musnad Ahmad 5:44

Abdullah narrated to us, Abd al-A’la ibn Hammad al-Narsi narrated to me, Dawud ibn Abd al-Rahman narrated to us, Abu Abd Allah Maslamah al-Razi narrated to us, from Abu ‘Amr al-Bajali, from Abd al-Malik ibn Sufyan al-Thaqafi, from Abu Ja’far Muhammad ibn Ali, from Muhammad ibn al-Hanafiyyah, from his father, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, Allah loves the believing servant who is frequently tested and frequently repentant."