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

2 Samuel 18:3

And they said, Thou shalt not go out: for if we should indeed flee, they will not care for us; and if half of us should die, they will not mind us; for thou [art] as ten thousand of us: and now [it is] well that thou shalt be to us an aid to help us in the city.

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