Numbers 6:13-21

Verse 18

Shall take the hair - and put it in the fire - The hair was permitted to grow for this purpose; and as the Nazarite was a kind of sacrifice, offered to God through the whole term of his nazarate or separation, and no human flesh or blood could be offered on the altar of the Lord, he offered his hair at the conclusion of his separation, as a sacrifice - that hair which was the token of his complete subjection to the Lord, and which was now considered as the Lord's property. The Hindoos, after a vow, do not cut their hair during the term of their vow; but at the expiration of it they shave it off at the place where the vow was made.

That the hair of the head was superstitiously used among different nations, we have already had occasion to remark; (See the notes on Lev 19:27); and that the Gentiles might have learned this from the Jews is possible, though some learned men think that this consecration of the hair to a deity was in use among the heathens before the time of Moses, and in nations who had no intercourse or connection with the Jews.
Verse 21

This is the law of the Nazarite - We learn from Maimonides, in his Treatise of the Nazarite, that a man might become a Nazarite in behalf of another; that is, might assist him in bearing the expenses of the sacrifices, etc. "A son may fulfill the vow his deceased father hath made, but did not live to accomplish: - He that saith, upon me be the shaving of a Nazarite, he is bound to bring the offerings of shaving for cleanness, and may offer them by the hand of what Nazarite he will. If he say, Upon me be half the oblations of a Nazarite, then he bringeth half the offerings by what Nazarite he will, and that Nazarite payeth his offerings out of that which is his." "By this," says Mr. Ainsworth, "we may see the reason of that which James said to Paul, though he had no Nazarite's vow upon him: 'We have four men who have a vow on them; them take and sanctify thyself with them, and Be At Charges With Them, that they may shave their heads, etc. Then Paul took the men, and the next day, sanctifying himself with them, entered into the temple to signify the accomplishment of the days of sanctification, (or Nazariteship), until that an offering should be offered for every one of them;' see Act 21:23-26. For though Paul had not vowed or fulfilled a Nazariteship himself, yet might he contribute with them, and partake of their charges about the sacrifices."
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