Musannaf Ibn Abi Shayba 13:2737

Abu Bakr narrated to us, he said: Waki’ and Ghundar narrated to us, from Shu’bah, from al-Hakam, from ‘Umarah ibn ‘Umayr al-Laythi, from his mother, from ‘A’ishah, she said: The Messenger of Allah (may Allah bless him and grant him peace) said: "A man’s child is from his earnings; [and] from the purest of his earnings."