Easton's Bible Dictionary
David at the cave of Adullam thus addressed his persecutor Saul (1 Samuel 24:14
): "After whom is the king of Israel come out? after whom dost thou pursue? after a dead dog, after a flea?" He thus speaks of himself as the poor, contemptible object of the monarch's pursuit, a "worthy object truly for an expedition of the king of Israel with his picked troops!" This insect is in Eastern language the popular emblem of insignificance. In 1 Samuel 26:20
the LXX. read "come out to seek my life" instead of "to seek a flea."
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Flea'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/f/flea.html. 1897.