Musnad Ahmad 33:1145

Sulayman ibn Dawud narrated to us, Abu Bakr ibn Ayyash narrated to us, al-A'mash narrated to me, from Abu Sufyan, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "A man who witnessed Badr and al-Hudaybiyyah will never enter the Fire."