Num 6:21

זֹ֣את תּוֹרַ֣ת הַנָּזִיר֮ אֲשֶׁ֣ר יִדֹּר֒ קָרְבָּנ֤וֹ לַֽיהוָה֙ עַל־נִזְר֔וֹ מִלְּבַ֖ד אֲשֶׁר־תַּשִּׂ֣יג יָד֑וֹ כְּפִ֤י נִדְרוֹ֙ אֲשֶׁ֣ר יִדֹּ֔ר כֵּ֣ן יַעֲשֶׂ֔ה עַ֖ל תּוֹרַ֥ת נִזְרֽוֹ׃ פ

This is the law of the Nazirite who vows his offering to the LORD for his separation, in addition to whatever else he can afford; he must fulfill whatever vow he makes, according to the law of his separation.”