Musnad Ahmad 32:1092

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from Qatadah, from Anas, who said: There was revealed to the Prophet, may Allah bless him and grant him peace, {That Allah may forgive for you what preceded of your sin and what will follow} [Al-Fath: 2] upon our return from Al-Hudaybiyyah. The Prophet, may Allah bless him and grant him peace, said: "There has been revealed to me a verse that is more beloved to me than all that is upon the earth." Then the Prophet, may Allah bless him and grant him peace, recited it to them. They said: "Congratulations and pleasantness to you, O Messenger of Allah. Allah, the Almighty and Majestic, has made clear to you what He will do with you, so what will He do with us?" Then there was revealed concerning them: {That He may admit the believing men and the believing women to gardens} [Al-Fath: 5], until He reached {a great attainment} [Al-Fath: 5].