Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
LXX

Numbers 11:18

And to the people thou shalt say, Purify yourselves for the morrow, and ye shall eat flesh; for ye wept before the Lord, saying, Who shall give us flesh to eat? for it was well with us in Egypt: and the Lord shall allow you to eat flesh, and ye shall eat flesh.

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