Musnad Abu Ya'la al-Mawsili 151:94

Yahya ibn Ayyub narrated to us, Ismail ibn Ja'far narrated to us, he said: And Amr ibn Abi Amr, the freed slave of al-Muttalib, informed me, from a man from the tribe of Abdullah ibn Mas'ud, from Ibn Mas'ud, from the Prophet (may Allah bless him and grant him peace), who said: "Whoever is easy, gentle, and accessible, Allah will forbid him to the Fire."