Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Usama. He says that when the day of Friday would come, Hazrat Umar bin Abdul Aziz used to send the guards, so they would stand at the doors of the mosque, and whoever they found with abundant hair, they would cut his hair.

It is narrated from Hazrat Wa'il bin Hujr. He says that the Noble Prophet (peace and blessings be upon him) saw me while my hair was long. So the Prophet (peace and blessings be upon him) said: "Fly, fly." So I went and cut that hair. Then the Prophet (peace and blessings be upon him) saw me and said: "By saying 'fly, fly,' I did not mean you. This is also good."

It is narrated from Hazrat Ibn Qudamah. He says that a man came to Hazrat Ibn Sirin and that man had long hair. So Ibn Sirin said: This is disliked. Then that person came to you the next day and he had completely shaved his head. So you said: This is also disliked.