Musannaf Ibn Abi Shaybah 14129 — The virtue of shaving

Wahb bin Abdullah narrates from his father, who said: I was with my father, and I saw the Prophet (peace and blessings be upon him) gesturing with his hand as he prayed: "O Allah, have mercy on those who shave their heads." A man said: "O Messenger of Allah (peace and blessings be upon him), and on those who shorten their hair?" The third time, he (peace and blessings be upon him) said: "And on those who shorten their hair as well."