Musannaf Ibn Abi Shayba 18:1169

Abu Bakr narrated to us, he said: Abbad and Abu Khalid narrated to us, from Hajjaj, from Amr ibn Shu'ayb, from his father, from his grandfather, from Umar, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "A father shall not be killed for his child."