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

Zechariah 12:10

And I will pour upon the house of David, and upon the inhabitants of Jerusalem, the spirit of grace and compassion: and they shall look upon me, because they have mocked [me], and they shall make lamentation for him, as for a beloved [friend], and they shall grieve intensely, as for a first-born [son].

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