8 These are the names of the warriors whom David had: Josheb-basshebeth a Tahchemonite; he was chief of the Three; he wielded his spear against eight hundred whom he killed at one time. 9 Next to him among the three warriors was Eleazar son of Dodo son of Ahohi. He was with David when they defied the Philistines who were gathered there for battle. The Israelites withdrew, 10 but he stood his ground. He struck down the Philistines until his arm grew weary, though his hand clung to the sword. The Lord brought about a great victory that day. Then the people came back to him-but only to strip the dead. 11 Next to him was Shammah son of Agee, the Hararite. The Philistines gathered together at Lehi, where there was a plot of ground full of lentils; and the army fled from the Philistines. 12 But he took his stand in the middle of the plot, defended it, and killed the Philistines; and the Lord brought about a great victory. 13 Towards the beginning of harvest three of the thirty chiefs went down to join David at the cave of Adullam, while a band of Philistines was encamped in the valley of Rephaim. 14 David was then in the stronghold; and the garrison of the Philistines was then at Bethlehem 15 David said longingly, "O that someone would give me water to drink from the well of Bethlehem that is by the gate!" 16 Then the three warriors broke through the camp of the Philistines, drew water from the well of Bethlehem that was by the gate, and brought it to David. But he would not drink of it; he poured it out to the Lord, 17 for he said, "The Lord forbid that I should do this. Can I drink the blood of the men who went at the risk of their lives?" Therefore he would not drink it. The three warriors did these things.
Matthew Henry's Commentary on 2 Samuel 23:8-17
Commentary on 2 Samuel 23:8-39
(Read 2 Samuel 23:8-39)
David once earnestly longed for the water at the well of Bethlehem. It seems to be an instance of weakness. He was thirsty; with the water of that well he had often refreshed himself when a youth, and it was without due thought that he desired it. Were his valiant men so forward to expose themselves, upon the least hint of their prince's mind, and so eager to please him, and shall not we long to approve ourselves to our Lord Jesus, by ready compliance with his will, as shown us by his word, Spirit, and providence? But David poured out the water as a drink-offering to the Lord. Thus he would cross his own foolish fancy, and punish himself for indulging it, and show that he had sober thoughts to correct his rash ones, and knew how to deny himself. Did David look upon that water as very precious which was got at the hazard of these men's blood, and shall not we much more value those benefits for purchasing which our blessed Saviour shed his blood? Let all beware of neglecting so great salvation.