LXX Num 6:5

πάσας τὰς ἡμέρας τοῦ ἁγνισμοῦ ξυρὸν οὐκ ἐπελεύσεται ἐπὶ τὴν κεφαλὴν αὐτοῦ· ἕως ἂν πληρωθῶσιν αἱ ἡμέραι ὅσας ηὔξατο κυρίῳ, ἅγιος ἔσται τρέφων κόμην τρίχα κεφαλῆς.

For the entire period of his vow of separation, no razor shall pass over his head. He must be holy until the time of his separation to the LORD is complete; he must let the hair of his head grow long.