According to Louis Ginzberg's Midrash anthology The Legends of the Jews: "Elated by the victory over Sisera, Israel sang a hymn of praise, the song of Deborah, and God, to reward them for their pious sentiments, pardoned the transgression of the people. But they soon slipped back into the old ways, and the old troubles harassed them. Their back-sliding was due to the witchcraft of a Midianite priest named Aud. He made the sun shine at midnight, and so convinced the Israelites that the idols of Midian were mightier than God, and God chastised them by delivering them into the hands of the Midianites. They worshipped their own images reflected in the water, and they were stricken with dire poverty. They could not bring so much as a meal offering, the offering of the poor. On the eve of one Passover, Gideon uttered the complaint: "Where are all the wondrous works which God did for our fathers in this night, when he slew the first-born of the Egyptians, and Israel went forth from slavery with joyous hearts?" God appeared unto him, and said: "Thou who art courageous enough to champion Israel, thou art worthy that Israel should be saved for thy sake."
To explain why the men who brought water to their mouths with their hands were chosen to fight, while the others who lapped the water directly or bowed down were not chosen, some writers explain that lapping directly is disgraceful and similar to a dog, while bowing down resembles idolatry. Those who were faithful were allowed to depart.
According to The Legends of the Jews: "...In the high priest's breastplate, Joseph was represented among the twelve tribes by Ephraim alone, not by Manasseh, too. To wipe out this slight upon his own tribe, Gideon made an ephod bearing the name of Manasseh. He consecrated it to God, but after his death homage was paid to it as an idol. In those days the Israelites were so addicted to the worship of Beelzebub that they constantly carried small images of this god with them in their pockets, and every now and then they were in the habit of bringing the image forth and kissing it fervently. Of such idolaters were the vain and light fellows who helped Abimelech, the son of Gideon by his concubine from Shechem, to assassinate the other sons of his father. But God is just. As Abimelech murdered his brothers upon a stone, so Abimelech himself met his death through a millstone. It was proper, then, that Jotham, in his parable, should compare Abimelech to a thorn-bush, while he characterized his predecessors, Othniel, Deborah, and Gideon, as an olive-tree, or a fig-tree, or a vine. This Jotham, the youngest of the sons of Gideon, was more than a teller of parables. He knew then that long afterward the Samaritans would claim sanctity for Mount Gerizim, on account of the blessing pronounced from it upon the tribe. For this reason he chose Gerizim from which to hurl his curse upon Shechem and it inhabitants." "Tan B 1 103. The parable of Jotham is said to refer to the prominent judges: Othniel [=Olive tree], Deborah [=fig tree], Gideon [=vine], and Elimelech [=bramble]. Tan. also states that Abimelech reigned for three years, as a reward for the modesty of his father Gideon, who in a "tripartite" sentence refused the royal crown offered him by his people; see Jud. 8.23. Abimelech, in contrast to his father [Jud.8.27], was very greedy for riches, and his end therefore came speedily; Aggadat Bereshit 26, 54., see also ibid., 52-53 where Abimelech's wickedness and greed was contrasted with the piety and liberality of his namesake Abimelech, the King of Getar. The ingratitude of the Israelites who permitted Abimelech to murder the children of their benefactor Gideon was counted unto them as though they had forsaken God; ingratitude is as grave a sin as idolatry; Yelammedenu in Yalkut II, 64."
