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

2 Samuel 12:18

And it came to pass on the seventh day that the child died: and the servants of David were afraid to tell him that the child was dead; for they said, Behold, while the child was yet alive we spoke to him, and he hearkened not to our voice; and how should we tell him that the child is dead?—so would he do [himself] harm.

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