1 Samuel 18:20-23

20 Saul had another daughter, Michal, and she loved David. When somebody told Saul about this, he was very happy. 21 He thought, ‘I will let David marry her. I will use her as a trap that will catch him. I will give the Philistines a chance to kill him.’ So Saul said to David, ‘Now you have another chance to marry one of my daughters.’

22 Saul told his servants to say secretly to David, ‘The king is pleased with you. His servants all like you. You should now marry the king's daughter.’

23 Saul's servants said this to David. But David replied, ‘It is a great honour for someone to marry the king's daughter. But I am poor. I am not important enough.’

18:23Men had to give money to the father of the woman they wanted to marry. And a king would want a lot of money for his daughter. David did not have enough money for that.