Ezekiel 44:20
Also, they are not to shave their heads nor let their hair grow long. Instead, they are certainly to trim the hair on their heads.
Numbers 6:5
During the entire time of his dedication, he is not to allow a razor to pass over his head until the days of his holy consecration to the LORD have been fulfilled. He is to let the locks on his head grow long.
Leviticus 21:5-24
"They are not to cut their hair in ritualistic patterns on their heads, deface the edges of their beards, or make incisions in their flesh.
Deuteronomy 14:1
"You are children of the LORD your God. You must not lacerate yourselves or shave your foreheads on account of the dead,
1 Corinthians 11:14
Nature itself teaches you neither that it is disgraceful for a man to have long hair