1:18 (Also he bade them teach the children of Judah {g} [the use of] the bow: behold, [it is] written in the book of Jasher.)
(g) That they might be able to match their enemies the Philistines in that art.
1:18 Judah - These he more particularly teacheth, because they were the chief, and now the royal tribe, and likely to be the great bulwark to all Israel against the Philistines, upon whose land they bordered; and withal, to be the most true to him, and to his interest. The bow - That is, of their arms, expressed, under the name of the bow, which then was one of the chief weapons; and for the dextrous use whereof Jonathan is commended in the following song: which may be one reason, why he now gives forth this order, that so they might strive to imitate Jonathan in military skill, and to excel in it, as he did. Jasher - It is more largely and particularly described in the book of Jasher.
1:17-27 Kasheth, or the bow, probably was the title of this mournful, funeral song. David does not commend Saul for what he was not; and says nothing of his piety or goodness. Jonathan was a dutiful son, Saul an affectionate father, therefore dear to each other. David had reason to say, that Jonathan's love to him was wonderful. Next to the love between Christ and his people, that affection which springs form it, produces the strongest friendship. The trouble of the Lord's people, and triumphs of his enemies, will always grieve true believers, whatever advantages they may obtain by them.