Musannaf Ibn Abi Shaybah 39631 — The Hudaybiyah campaign

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said on the day of al-Hudaybiyah: "May Allah, the Pure, have mercy on those who shave their heads." The Companions asked: "O Messenger of Allah, 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." He (peace and blessings be upon him) said this three times. The Companions said: "O Messenger of Allah (peace and blessings be upon him), on those who shorten their hair?" He (peace and blessings be upon him) said: "On those who shorten their hair (too, have mercy)." The Companions said: "O Messenger of Allah (peace and blessings be upon him), what was the reason that you made the supplication for mercy more (three times) for those who shave their heads?" He (peace and blessings be upon him) said: "They did not doubt to any degree."