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

Deuteronomy 31:6

Be courageous and strong, fear not, neither be cowardly, neither be afraid before them; for [it is] the Lord your God that advances with you in the midst of you, neither will he by any means forsake thee, nor desert thee.

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