1 Samuel 18:13-27

Therefore Saul removed him from him, and made him his captain over a thousand; and he went out and came in before the people. And David behaved himself wisely in all his ways; and the LORD was with him. Wherefore when Saul saw that he behaved himself very wisely, he was afraid of him. But all Israel and Judah loved David, because he went out and came in before them. And Saul said to David, Behold my elder daughter Merab, her will I give thee to wife: only be thou valiant for me, and fight the LORD's battles. For Saul said, Let not mine hand be upon him, but let the hand of the Philistines be upon him. And David said unto Saul, Who am I? and what is my life, or my father's family in Israel, that I should be son in law to the king? But it came to pass at the time when Merab Saul's daughter should have been given to David, that she was given unto Adriel the Meholathite to wife. And Michal Saul's daughter loved David: and they told Saul, and the thing pleased him. And Saul said, I will give him her, that she may be a snare to him, and that the hand of the Philistines may be against him. Wherefore Saul said to David, Thou shalt this day be my son in law in the one of the twain. And Saul commanded his servants, saying, Commune with David secretly, and say, Behold, the king hath delight in thee, and all his servants love thee: now therefore be the king's son in law. And Saul's servants spake those words in the ears of David. And David said, Seemeth it to you a light thing to be a king's son in law, seeing that I am a poor man, and lightly esteemed? And the servants of Saul told him, saying, On this manner spake David. And Saul said, Thus shall ye say to David, The king desireth not any dowry, but an hundred foreskins of the Philistines, to be avenged of the king's enemies. But Saul thought to make David fall by the hand of the Philistines. And when his servants told David these words, it pleased David well to be the king's son in law: and the days were not expired. Wherefore David arose and went, he and his men, and slew of the Philistines two hundred men; and David brought their foreskins, and they gave them in full tale to the king, that he might be the king's son in law. And Saul gave him Michal his daughter to wife.