And Jesse took an ass laden with bread, and a bottle of wine, and a kid, and sent them by David his son unto Saul.

Wesley's Notes

16:20 Sent him - This present, though in our times it would seem contemptible, yet was very agreeable to the usage of those times, and to the condition of Jesse, which was but mean in the world. And it seems to have been the custom of those times, (as it is yet in the eastern countries) when they made their appearance before princes, or great persons, to bring a present.

Jamieson-Fausset-Brown Bible Commentary

20. Jesse took an ass laden with bread, and a bottle of wine, and a kid, and sent them . unto Saul-as a token of homage and respect.

Matthew Henry's Concise Commentary

16:14-23 Saul is made a terror to himself. The Spirit of the Lord departed from him. If God and his grace do not rule us, sin and Satan will have possession of us. The devil, by the Divine permission, troubled and terrified Saul, by the corrupt humours of his body, and passions of his mind. He grew fretful, peevish, and discontented, and at times a madman. It is a pity that music, which may be serviceable to the good temper of the mind, should ever be abused, to support vanity and luxury, and made an occasion of drawing the heart from God and serious things. That is driving away the good Spirit, not the evil spirit. Music, diversions, company, or business, have for a time often been employed to quiet the wounded conscience; but nothing can effect a real cure but the blood of Christ, applied in faith, and the sanctifying Spirit sealing the pardon, by his holy comforts. All other plans to dispel religious melancholy are sure to add to distress, either in this world or the next.