Musnad Ahmad 323:0

Narrated by Abdullah ibn Atik: The Messenger of Allah (peace be upon him) said: "Whoever dies while he is a believer, having hope in Allah, and fearing Him, Allah will forgive him his past and future sins." He said: "And whoever dies while he is a believer, having hope in Allah, and fearing Him, Allah will forgive him his past and future sins." He said: "And whoever dies while he is a believer, having hope in Allah, and fearing Him, Allah will forgive him his past and future sins."