'Posterity' in the Bible

The Lord GOD hath sworn by his holiness, that, lo, the days shall come upon you, that he will take you away with hooks, and your posterity with fishhooks.

I have seen the Lord standing by the altar, and He saith: 'Smite the knob, and the thresholds shake, And cut them off by the head -- all of them, And their posterity with a sword I do slay, Not flee to them doth the fleer, Nor escape to them doth a fugitive.