1 Samuel 17:28

ELIAB ANGRILY OPPOSES DAVID'S INTENTION

"Now Eliab his eldest brother heard when he spoke to the men; and Eliab's anger was kindled against David, and he said, "Why have you come down, and with whom have you left those few sheep in the wilderness? I know your presumption and the evil of your heart; for you have come down to see the battle." And David said, "What have I done now? Was it not but a word"? And he turned away from him toward another, and spoke in the same way; and the people answered him again as before."

"Eliab's anger was kindled" (1 Samuel 17:28). The reason for Eliab's anger is not readily discernible. Some have ascribed it to "jealousy."[14] His mention of the sheep sounds unreasonable, because the bringing of supplies from their father made it clear that David had Jesse's permission to make the journey. Perhaps Willis has the best explanation: "He was angry with David for associating with the soldiers, indirectly chastising them for not accepting Goliath's challenge, and implying that he (David) was able to defeat the giant."[15] That David had indeed indicated that he was able to fight the giant is clear from 1 Samuel 17:31. "The very things with which Eliab charged his brother, presumption and wickedness of heart, were very apparent in Eliab's scornful reproof."[16]

Before leaving this, it should not be overlooked that as the great O.T. type of the Son of God, David's brethren rejected him, just as Jesus' brethren later rejected him.