Musannaf Ibn Abi Shayba 21:153

Ibn Numayr narrated to us, from Musa ibn Aslam, from ‘Amr ibn Murrah, who attributed it (to the Prophet), he said: "Whoever is occupied by My remembrance from asking Me, I shall give him more than what I give to those who ask." Meaning: The Lord, Blessed and Exalted is He.