Dead flies cause the ointment of the perfumer to send forth a foul odor: so does a little folly to him that is respected for wisdom and honor.
All Commentaries on Ecclesiastes 10:1 Go To Ecclesiastes 10
Didymus the Blind
AD 398
These flies bring death as well as life. For example there is a divinized fly about which Elijah has said, “Is there no God in Israel that you are sending to inquire of the fly, the God of Ekron?” I would be astonished if they really did divinize a fly. Rather he hereby has described the worthlessness of their enterprise.