Ezekiel 44:20
They must not shave their heads or let their hair grow long. They must keep the hair on their heads trimmed.
Numbers 6:5
As long as they are under the Nazirite vow no razor may touch their heads. During the entire time that they are dedicated to Jehovah as Nazirites, they will be holy. They must let their hair grow long.
Leviticus 21:5-24
You should never mourn by shaving bald spots on your heads, shaving the edges of your beards, or slashing your bodies.
Deuteronomy 14:1
You are the sons of Jehovah your God. Do not cut yourselves nor shave your forehead for the sake of the dead.
1 Corinthians 11:14
Does not even nature itself teach you, that, if men have long hair, it is a shame?