Acts 21:24

Be at charges with them - Or, rather, be at charges for them: help them to bear the expense of that vow. Eight lambs, four rams, besides oil, flour, etc., were the expenses on this occasion. See the notes on Numbers 6:1-21 (note).

Thou - walkest orderly and keepest the law - Perhaps this advice meant no more than, Show them, by such means as are now in thy power, that thou art not an enemy to Moses; that thou dost still consider the law to be holy, and the commandment holy, just, and good. Paul did so, and bore the expenses of those who, from a scruple of conscience, had made a vow, and perhaps were not well able to bear the expense attending it. Had they done this in order to acquire justification through the law, Paul could not have assisted them in any measure with a clear conscience; but, as he did assist them, it is a proof that they had not taken this vow on them for this purpose. Indeed, vows rather referred to a sense of obligation, and the gratitude due to God for mercies already received, than to the procuring of future favors of any kind. Besides, God had not yet fully shown that the law was abolished, as has already been remarked: he tolerated it till the time that the iniquity of the Jews was filled up; and then, by the destruction of Jerusalem, he swept every rite and ceremony of the Jewish law away, with the besom of destruction.

Them take - Take with you. Join yourself with them.

And purify thyself with them - Join them in observing the forms of purification prescribed by the Law of Moses in the observance of the vow of the Nazarite. The purifying here refers to the vows of sanctity which the Nazarites were to observe. They were to abstain from wine and strong drink; they were to eat no grapes, moist or dried; they were to come near no dead body, nor to make themselves "unclean" for their father, mother, brother, or sister, when they died Numbers 6:3-7; and they were to present an offering when the days of the vow were completed, Numbers 6:8.

And be at charges with them - Share with them the expense of the offerings required when the vow is completed. Those offerings were a ram of a year old for a burnt-offering, a sheep of the same age for a sin-offering, a ram for a thank-offering, a basket of unleavened cakes, and a libation of wine. See Numbers 6:13-20.

That they may shave their heads - The shaving of the head, or the cutting off the hair which had been suffered to grow during the continuance of the vow Numbers 6:5, was an observance indicating that the vow had been performed. Paul was requested to join with them in the expense of the offerings, that thus, the whole of the ceremonies having been observed, their heads might be shaved as an indication that every part of the vow had been complied with.

And all may know - By the fact of your observance of one of the rites of the Mosaic religion, all may have evidence that it is not your purpose or practice to speak contemptuously of those rites, or to undervalue the authority of Moses.

Are nothing - Are untrue, or without any foundation.

Walkest orderly - That you live in accordance with the real requirements of the Law of Moses. To walk, in the Scriptures, often denotes "to live, to act, to conduct in a certain manner." All, probably, that they wished Paul to show by this was, that he was not an enemy of Moses. They who gave this counsel were Christians, and they could not wish him to do anything which would imply that he was not a Christian.

21:24 And all will know - that thou thyself walkest orderly, keeping the law - Ought he not, without any reverence to man, where the truth of God was so deeply concerned, to have answered plainly, I do not keep the Mosaic law; neither need any of you. Yea, Peter doth not keep the law. And God himself expressly commanded him not to keep it; ordering him to go in to men uncircumcised, and to eat with them, Acts 11:3 , which the law utterly forbids.