This is the number of the mighty men whom David had: Jashobeam, the son of a Hachmonite, the chief of the thirty; he lifted up his spear against three hundred and killed them at one time.
And so he poured the water out on the ground because he just felt unworthy to drink that water. He felt that those guys that were willing to hazard their lives for a thing like that better that they give it to the Lord. So he poured it out to the Lord, verse eighteen.