Musnad Ahmad 30:2958

Waki’ narrated to us, he said: ‘Abbad bin Mansur and Isma’il narrated to us, he said: ‘Abbad informed us—the meaning—from Al-Qasim bin Muhammad, he said: I heard Abu Hurairah saying—Isma’il said: From Abu Hurairah—the Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, Allah, the Almighty and Majestic, accepts charities and takes them with His Right Hand, then He nurtures them for one of you just as one of you nurtures his foal or his young camel, until a single morsel becomes like Mount Uhud." Waki’ said in his narration: And the confirmation of that is in the Book of Allah: "It is He who accepts repentance from His servants" [Ash-Shura: 25], "And He takes charities" [At-Tawbah: 104], and "Allah destroys interest and nurtures charities" [Al-Baqarah: 276].