Bede : Saul therefore sent to Jesse, saying: Send David to me, etc. Newly catechized Jews sent words of their intention as signs to those who had gone before in Christ, saying: Believe in our fellowship of salvation through baptism in Christ, whom we have always learned in our hearts by faith, hope, and charity, to be born, ministering the pastures of eternal life to all the blessed, both angels and men. Complying with the just petitions of the brethren, they lent to them the mysteries of Christ to be received. They did not do this hesitantly, but according to him who, saying to his disciples: Go, teach all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit (Matt. 28): he immediately added and said, Teaching them to observe all things whatsoever I have commanded you (Ibid.). Among the sacraments of faith, with which they were initiated outwardly, they also sent examples of virtues, by which they were inwardly nourished: for bread and wine are spiritual virtues and doctrine. For bread strengthens the heart of man (Psalms 103). And your cup, he says, inebriating, how glorious it is (Psalms 22)! A kid from the goats is a humble sign of repentance, separated from the wanton flock of sinners: for a kid used to be offered for sins according to the law. These David carries to Saul on a donkey given by Jesse, when any wise teacher by the grace of Christ instructing his listeners, frequently recalls that the grace of virtues which they should imitate abounds in the humble and those despised by human judgment. It is notable that in the anointing of Saul, which also signifies the kingdom of Christ, donkeys, bread, a jug of wine, and also kids are found: as has been discussed in its proper place. — Commentary on Samuel