The general meaning is: Jonathan had a presentiment, doubtless from God, that David would be established upon the throne. By God's mercy he had the comfort, which he well deserved, of knowing that his own posterity would receive kindness at David's hand (see the marginal references).

Show me the kindness of the Lord - When thou comest to the kingdom, if I am alive, thou shalt show kindness to me, and thou shalt continue that kindness to my family after me.

And thou shalt not only, while yet I live, show me the kindness of the Lord,.... Such kindness as is well pleasing in the sight of God, and imitate what he shows to men, and which was covenanted, promised, and agreed to in the presence of the Lord, when David and Jonathan entered into covenant with each other; this Jonathan did not doubt of, and therefore did not make this a request:

that I die not; he had no fear nor dread on his mind, should David come to the throne while he was alive, that he would take away his life; which was usually done by tyrants and usurpers, when there were any that had a fairer title, and better claim to the throne than they.

And thou shalt not only while yet I live shew me the kindness of the LORD, {h} that I die not:

(h) I know that if you were given the kingdom now, you would not destroy me, but show yourself friendly to my posterity.

20:14 Kindness as the Lord - That kindness to which thou hast engaged thyself, in the covenant sworn between thee and me in God's presence. I die not - That thou do not kill me or mine, as princes of another line use to kill the nearest relations of the former line, from whom the kingdom was translated to them.

20:11-23 Jonathan faithfully promises that he would let David know how he found his father affected towards him. It will be kindness to ourselves and to ours, to secure an interest in those whom God favours, and to make his friends ours. True friendship rests on a firm basis, and is able to silence ambition, self-love, and undue regard for others. But who can fully understand the love of Jesus, who gave himself as a sacrifice for rebellious, polluted sinners! how great then ought to be the force and effects of our love to him, to his cause, and his people!