Moses
Numbers 6:21ESV·traditional attribution

“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.”

Matthew Henry Presbyterian @wholebiblehenry

After the law for the discovery and shame of those that by sin had made themselves vile, fitly follows this for the direction and encouragement of those who by their eminent piety and devotion had made themselves honourable, and distinguished themselves from their neighbours.

Commenting on Numbers 6:1-21

John Gill Reformed Baptist @doctorgill

And the Lord spake unto Moses,.... At the same time perhaps that the above law was given concerning the Nazarites; though why this should follow upon that, and what connection there is between the one and the other, it is not easy to say; the Nazarites were holy persons, and so were the priests; and therefore, according to Aben Ezra and others, the law of...

Geneva Bible Notes Reformed @genevanotes

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. (k) At the least he shall do this, if he is not able to offer more.