כָּל־יְמֵי֙ נֶ֣דֶר נִזְר֔וֹ תַּ֖עַר לֹא־יַעֲבֹ֣ר עַל־רֹאשׁ֑וֹ עַד־מְלֹ֨את הַיָּמִ֜ם אֲשֶׁר־יַזִּ֤יר לַיהוָה֙ קָדֹ֣שׁ יִהְיֶ֔ה גַּדֵּ֥ל פֶּ֖רַע שְׂעַ֥ר רֹאשֽׁוֹ׃
All the days of his vow of Naziriteship there shall no razor come upon his head; until the days be fulfilled, in which he consecrateth himself unto the LORD, he shall be holy, he shall let the locks of the hair of his head grow long.
On the Unchangeableness of God
[88] For all these things, through the power of God, admit of change and transition, so as often to produce effects quite the reverse of the ordinary. He who makes this vow then, says Moses, must be “holy, suffering the hair of his head to grow” (Num. 6:5). This means that he must foster the young growths of virtue’s truths in the mind which rules his being; these growths must be to him as it were heads, and he must take pride in them as in the glory of the hair.
On Dreams
[253] For the lawgiver says, “He shall be holy that letteth the locks of the hair of his head grow long” (Num. 6:5), that is, the man who has made the vow; and if he is holy, he is nothing else than a dedicated offering, seeing that he no more comes in contact with anything unhallowed and profane.