And Jonathan Saul's son arose, and went to David into the wood, and strengthened his hand in God.

Wesley's Notes

23:16 And strengthened - He comforted and supported him against all his fears, by minding him of God's infallible promises made to him, and his singular providence which hitherto had and still would be with him.

Jamieson-Fausset-Brown Bible Commentary

16, 17. Jonathan went to David into the wood, and strengthened his hand in God-by the recollection of their mutual covenant. What a victory over natural feelings and lower considerations must the faith of Jonathan have won, before he could seek such an interview and give utterance to such sentiments! To talk with calm and assured confidence of himself and family being superseded by the man who was his friend by the bonds of a holy and solemn covenant, could only have been done by one who, superior to all views of worldly policy, looked at the course of things in the spirit and through the principles of that theocracy which acknowledged God as the only and supreme Sovereign of Israel. Neither history nor fiction depicts the movements of a friendship purer, nobler, and more self-denying than Jonathan's!

Matthew Henry's Concise Commentary

23:14-18 David made no attempt against Saul; he kept God's way, waited God's time, and was content to secure himself in woods and wildernesses. Let it make us think the worse of this world, which often gives such bad treatment to its best men: let it make us long for that kingdom where goodness shall for ever be in glory, and holiness in honour. We find Jonathan comforting David. As a pious friend, he directed him to God, the Foundation of his comfort. As a self-denying friend, he takes pleasure in the prospect of David's advancement to the throne. As a constant friend, he renewed his friendship with him. Our covenant with God should be often renewed, and therein our communion with him kept up. If the converse of one friend, at one meeting, gives comfort and strengthens our hearts, what may not be expected from the continual supports and powerful love of the Saviour of sinners, the covenanted Friend of believers!