1 Samuel 17:28

And Eliab, his eldest brother, heard when he spake unto the men, and Eliab's anger was kindled against David, and he said, Why camest thou down hither, from the higher ranges near Bethlehem? And with whom hast thou left those few sheep in the wilderness? He intimated that their family could ill afford to lose the few heads of small cattle which they owned. His zeal was blinded by envy and jealousy. I know thy pride and the naughtiness of thine heart; for thou art come down that thou mightest see the battle. The intimation was that David was not satisfied with his lowly calling, that he wished to rise above his station and take part in the war, since his wickedness enjoyed the brutality of the battle. Eliab's is a type of a small soul, incapable of great thoughts and deeds.