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

2 Samuel 18:20

And Joab said to him, Thou [shalt] not [be] a messenger of glad tidings this day; thou shalt bear them another day; but on this day thou shalt bear no tidings, because the king's son is dead.

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