Musnad Ahmad 30:935

Bahz and 'Affan narrated to us, they said: Hammad ibn Salamah narrated to us, from Ishaq ibn 'Abdullah, from 'Abd al-Rahman ibn Abi 'Amrah, from Abu Hurairah, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Indeed, an angel at one of the gates of heaven says: 'Whoever lends today, shall be rewarded tomorrow.' And an angel at another gate says: 'O Allah, grant a successor to the one who spends, and grant destruction to the one who withholds.'"