Numbers 6:18
“And the Nazarite shall shave the head of his separation at the door of the tabernacle of the congregation, and shall take the hair of the head of his separation, and put it in the fire which is under the sacrifice of the peace offerings.”
And the priest shall bring them before the Lord, and shall offer his sin offering, and his burnt offering:
And he shall offer the ram for a sacrifice of peace offerings unto the Lord, with the basket of unleavened bread: the priest shall offer also his meat offering, and his drink offering.
And the Nazarite shall shave the head of his separation at the door of the tabernacle of the congregation, and shall take the hair of the head of his separation, and put it in the fire which is under the sacrifice of the peace offerings.
And the priest shall take the sodden shoulder of the ram, and one unleavened cake out of the basket, and one unleavened wafer, and shall put them upon the hands of the Nazarite, after the hair of his separation is shaven:
And the priest shall wave them for a wave offering before the Lord: this is holy for the priest, with the wave breast and heave shoulder: and after that the Nazarite may drink wine.
Why This Verse Was Tagged
This verse contains specific terms directly associated with this theme.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And Paul after this tarried there yet a good while, and then took his leave of the brethren, and sailed thence into Syria, and with him Priscilla and Aquila; having shorn his head in Cenchrea: for he had a vow.”
“And if any man die very suddenly by him, and he hath defiled the head of his consecration; then he shall shave his head in the day of his cleansing, on the seventh day shall he shave it.”
“And Paul after this tarried there yet a good while, and then took his leave of the brethren, and sailed thence into Syria, and with him Priscilla and Aquila; having shorn his head in Cenchrea: for he had a vow.”
“All the days of the vow of his separation there shall no razor come upon his head: until the days be fulfilled, in the which he separateth himself unto the Lord, he shall be holy, and shall let the locks of the hair of his head grow.”
“Them take, and purify thyself with them, and be at charges with them, that they may shave their heads: and all may know that those things, whereof they were informed concerning thee, are nothing; but that thou thyself also walkest orderly, and keepest the law.”