Musannaf Ibn Abi Shaybah 39629 — The Hudaybiyah campaign

It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) and his Companions had their heads shaved on the day of al-Hudaybiyah, except Sayyiduna Uthman (may Allah be pleased with him) and Sayyiduna Abu Qatadah (may Allah be pleased with him). The Messenger of Allah (peace and blessings be upon him) said: "May Allah Almighty have mercy on those who shave their heads." The people asked: "O Messenger of Allah (peace and blessings be upon him), and on those who shorten their hair?" He (peace and blessings be upon him) said (again): "May Allah Almighty have mercy on those who shave their heads." The Companions asked (a third time): "And on those who shorten their hair, O Messenger of Allah (peace and blessings be upon him)?" He said: "May Allah Almighty have mercy on those who shave their heads." The Companions said: "And on those who shorten their hair, O Messenger of Allah (peace and blessings be upon him)?" He said: "On those who shorten their hair (too, may He have mercy)."