Musannaf Ibn Abi Shaybah 35340 — Those whom it is forbidden to kill

Yazid bin Hurmuz (may Allah have mercy on him) reports: Najdah wrote to Sayyiduna Ibn Abbas (may Allah be pleased with them both) asking about the killing of children, and he wrote in his letter that a learned man who was the companion of Musa (peace be upon him) had killed a child. Yazid said: With my own hand I wrote the letter of Sayyiduna Ibn Abbas (may Allah be pleased with them both) to Najdah: "You wrote asking about the killing of children, and you said in your letter that a learned man who was the companion of Musa (peace be upon him) had indeed killed a child. If you too knew that thing about the children, then you too would kill him. But you do not know. The Messenger of Allah (peace and blessings be upon him) has indeed forbidden the killing of children, so keep away from them."