1 Samuel 20:15

Thou shalt not cut off thy kindness from my house The covenant they had made was not merely personal, but reached to their posterity, and was to be kept even when David should have the greatest power, and there were none to oppose his will. These verses seem strongly to indicate that Jonathan knew of David's being anointed to the kingdom! How unspeakable a generosity is here shown by Jonathan to stipulate for his own life, and the lives of his posterity, with that man whose life, humanly speaking, was now in his power!