'Pursuer' in the Bible

And the men of Ai look behind them, and see, and lo, the smoke of the city hath gone up unto the heavens, and there hath not been in them power to flee hither and thither -- and the people who are fleeing to the wilderness have turned against the pursuer, --

Their way is darkness and slipperiness, And a messenger of Jehovah their pursuer.

The wicked have fled and there is no pursuer. And the righteous as a young lion is confident.

And go out from the daughter of Zion doth all her honour, Her princes have been as harts -- They have not found pasture, And they go powerless before a pursuer.