Saul said, I will give her to him, that she may be a snare to him, and that the hand of the Philistines may be against him. Therefore Saul said to David, You shall this day be my son-in-law a second time.
thou shalt this day be my son in law in [the one of] the twain; by marrying one of his two daughters; signifying, that he would not defer the marriage, or put it off to a longer time, as he had done before, but that he should be married immediately to one or other of his daughters; and seeing he could not have the eldest, she being disposed of, he should have the youngest, and so be equally his son-in-law. If we read the words without the supplement, "shalt be my son-in-law in the two", or in both, the sense is, that he should have them both; and so the Jews say w, that he married them both, first Merab, and after her death Michal; or that he should be his son-in-law on two accounts, one by betrothing Merab, though he was not married to her, and the other by being married to Michal, so that he would be doubly his son in law; but the sense, according to the supplement, is best.