Matthew Henry on 1 Samuel 17:31-39
David is at length presented to Saul for his champion (Sa1 17:31) and he bravely undertakes to fight the Philistine (Sa1 17:32): Let no man's heart fail because of him. It would have reflected too much upon the valour of his prince if he had said, Let not thy heart fail; therefore he speaks generally: Let no man's heart fail. A little shepherd, come but this morning from keeping sheep, has more courage than all the mighty men of Israel, and encourages them. Thus does God often send good words to his Israel, and do great things for them, by the weak and foolish things of the world. David only desires a commission from Saul to go and fight with the Philistine, but says nothing to him of the re…
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a lion, and a bear--There were two different rencontres, for those animals prowl alone. The bear must have been a Syrian bear, which is believed to be a distinct species, or perhaps a variety, of the brown bear. The beard applies to the lion alone. Those feats seem to have been performed with no weapons more effective than the rude staves and stones of the field, or his shepherd's crook.
Adam Clarke on 1 Samuel 17:35
The slaying of the lion and the bear mentioned here, must have taken place at two different times; perhaps the verse should be read thus: I went out after him, (the lion). and smote him, etc. And when he (the bear) rose up against me, I caught him by the beard and slew him.
John Gill on 1 Samuel 17:36
Thy servant slew both the lion and the bear,.... At different times, and several of them at one time or another; whenever any of them came into the flock, he used to lay hold on them and kill them, with all the ease imaginable. The Jews suppose this phrase denotes many of them (h).
And this uncircumcised Philistine shall be as one of them; as he was like them in nature, savage, cruel and unclean, so he would be in his end, killed as they; of this David was fully persuaded and assured in mind having an impulse from the Spirit of God, by which he was certified of it:
seeing he hath defied the armies of the living God; so that as he justly deserved to die, he made no doubt of it it would be h…