مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4031
Musnad of Abdullah bin Mas'ood
It was narrated that 'Abdullah Ibn Mas'aod said: The Messenger of Allah (ﷺ) divided the booty of Hunain at al-Ji'ranah. They crowded around him and the Messenger of Allah (ﷺ) said: “One of the slaves of Allah was sent by Allah, may He be glorified and exalted, to his people but they disbelieved him and wounded him in the head. He started wiping the blood from his forehead and saying: Lord forgive my people for they do not know.” ‘Abdullah said It is as if I can see The Messenger of Allah (ﷺ) wiping his forehead and showing how that man did.
Musnad Ahmad 4057Saheeh; this is a hasan isnad]