'Spared' in the Bible

David captured from him one thousand and seven hundred horsemen and twenty thousand {foot soldiers}. David hamstrung all the chariot horses, but {from them} he spared a hundred chariot horses.

But the king spared Mephibosheth the son of Jonathan, the son of Saul, because of the sworn oath of Yahweh which [was] between them, between David and Jonathan the son of Saul.