Musannaf Ibn Abi Shaybah 22445 — A man who picks up an abandoned child

It is narrated from al-Miswar bin Zayd that a woman found a child. She raised him and spent on him until he grew into a young man. Then the woman demanded her expenses from the boy. A letter was written to Umar bin Abd al-Aziz (may Allah have mercy on him) seeking the ruling on the boy. He replied that the woman should be made to swear an oath that she did not spend on the boy with the intention of earning reward. If she swears, the boy will be told to work to earn the expenses.