18:12-30 For a long time David was kept in continual apprehension of falling by the hand of Saul, yet he persevered in meek and respectful behaviour towards his persecutor. How uncommon is such prudence and discretion, especially under insults and provocations! Let us inquire if we imitate this part of the exemplary character before us. Are we behaving wisely in all our ways? Is there no sinful omission, no rashness of spirit, nothing wrong in our conduct? Opposition and perverseness in others, will not excuse wrong tempers in us, but should increase our care, and attention to the duties of our station. Consider Him that endured contradiction of sinners against himself, lest ye be weary and faint in your minds, Heb 12:3. If David magnified the honour of being son-in-law to king Saul, how should we magnify the honour of being sons to the King of kings!

25. The king desireth not any dowry—In Eastern countries the husband purchases his wife either by gifts or services. As neither David nor his family were in circumstances to give a suitable dowry for a princess, the king intimated that he would be graciously pleased to accept some gallant deed in the public service.

a hundred foreskins of the Philistines—Such mutilations on the bodies of their slain enemies were commonly practised in ancient war, and the number told indicated the glory of the victory. Saul's willingness to accept a public service had an air of liberality, while his choice of so difficult and hazardous a service seemed only putting a proper value on gaining the hand of a king's daughter. But he covered unprincipled malice against David under this proposal, which exhibited a zeal for God and the covenant of circumcision.