Numbers 6:21

21 “ ‘This is the law of the Nazirite who vows offerings to the LORD in accordance with their dedication, in addition to whatever else they can afford. They must fulfill the vows they have made, according to the law of the Nazirite.’ ”

Read Numbers 6:21 Using Other Translations

This is the law of the Nazarite who hath vowed, and of his offering unto the LORD for his separation, beside that that his hand shall get: according to the vow which he vowed, so he must do after the law of his separation.
"This is the law of the Nazirite. But if he vows an offering to the LORD above his Nazirite vow, as he can afford, in exact accordance with the vow that he takes, then he shall do in addition to the law of the Nazirite."
“This is the ritual law of the Nazirites, who vow to bring these offerings to the LORD . They may also bring additional offerings if they can afford it. And they must be careful to do whatever they vowed when they set themselves apart as Nazirites.”