'Affinity' in the Bible

should we again break thy commandments, and join in affinity with the peoples of these abominations? wouldest thou not be angry with us till thou hadst consumed us, so that there should be no remnant nor any to escape?

And after the course of years they shall join affinity; and the king's daughter of the south shall come to the king of the north to make equitable conditions: but she shall not retain the strength of her arm; neither shall he stand, nor his arm; and she shall be given up, she and they that brought her, and he that begat her, and he that strengthened her in those times.