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Lev. 19:19
See Leviticus 19:16.
Leviticus 19:18.
Jesus is never mentioned in the Book of Leviticus. However, Jesus was Quoting Leviticus (19:18) when he said , Love your neighbour as yourself.
Here are the verses in Hebrew law (yes it applies to Christians), concerning the wearing of hair and beards; your answer lies within these verses.
Leviticus 13:29,30
Leviticus 14:9
Leviticus 19:27
Leviticus 21:5