Musnad Ahmad 1034:197

Yazid narrated to us, Hajjaj informed us, from Abd al-Rahman ibn Abis, from his father, from Hudhayfah, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: "Whoever makes a condition for his brother and does not intend to fulfill it for him, he is like one who lowers his neighbor into a place with no protection."