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

Deuteronomy 31:7

And Moses called Joshua, and said to him before all Israel, Be courageous and strong; for thou shalt go in before this people into the land which the Lord sware to your fathers to give to them, and thou shalt give it to them for an inheritance.

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