Musannaf Ibn Abi Shayba 35:165

Ibn Abi Za’idah narrated to us, from al-A’mash, from ‘Umarah ibn ‘Umayr, from ‘A’ishah, who said: The Prophet (peace and blessings of Allah be upon him) said: "Indeed, the best of what you eat is from your earnings, and indeed your children are from your earnings."