31 When the words which David spoke were heard, they repeated them before Saul; and he sent for him. 32 And David said to Saul, "Let no man's heart fail because of him; your servant will go and fight with this Philistine." 33 And Saul said to David, "You are not able to go against this Philistine to fight with him; for you are but a youth, and he has been a man of war from his youth." 34 But David said to Saul, "Your servant used to keep sheep for his father; and when there came a lion, or a bear, and took a lamb from the flock, 35 I went after him and smote him and delivered it out of his mouth; and if he arose against me, I caught him by his beard, and smote him and killed him. 36 Your servant has killed both lions and bears; and this uncircumcised Philistine shall be like one of them, seeing he has defied the armies of the living God." 37 And David said, "The Lord who delivered me from the paw of the lion and from the paw of the bear, will deliver me from the hand of this Philistine." And Saul said to David, "Go, and the Lord be with you!" 38 Then Saul clothed David with his armor; he put a helmet of bronze on his head, and clothed him with a coat of mail. 39 And David girded his sword over his armor, and he tried in vain to go, for he was not used to them. Then David said to Saul, "I cannot go with these; for I am not used to them." And David put them off.
Matthew Henry's Commentary on 1 Samuel 17:31-39
Commentary on 1 Samuel 17:31-39
(Read 1 Samuel 17:31-39)
A shepherd lad, come the same morning from keeping sheep, had more courage than all the mighty men of Israel. Thus God often sends good words to his Israel, and does great things for them, by the weak and foolish things of the world. As he had answered his brother's passion with meekness, so David answered Saul's fear with faith. When David kept sheep, he proved himself very careful and tender of his flock. This reminds us of Christ, the good Shepherd, who not only ventured, but laid down his life for the sheep. Our experience ought to encourage us to trust in God, and be bold in the way of duty. He that has delivered, does and will continue to do so. David gained leave to fight the Philistine. Not being used to such armour as Saul put upon him, he was not satisfied to go in that manner; this was from the Lord, that it might more plainly appear he fought and conquered in faith, and that the victory was from Him who works by the feeblest and most despised means and instruments. It is not to be inquired how excellent any thing is, but how proper. Let Saul's coat be ever so rich, and his armour ever so strong, what is David the better if they fit him not? But faith, prayer, truth, and righteousness; the whole armour of God, and the mind that was in Christ; are equally needful for all the servants of the Lord, whatever may be their work.