Musannaf Ibn Abi Shayba 13:3062

Husayn ibn Ali, from Za'idah, from Abd al-Malik ibn Umayr, from Rib'i, from Abu al-Yasar: He said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever grants respite to one in hardship, or waives [the debt] for him, Allah will shade him in the shade of His Throne."