Midrash su Salmi 14:4

You find that everything written in praise of Jethro is mentioned to the discredit of Esau. In reference to Esau it is written: They have ravished the women in Zion (Lam. 5:11), but about Jethro it says: And he gave Moses, Zipporah, his daughter (Exod. 2:21). Concerning Esau it is written: Who eat up My people as they eat bread (Ps. 14:4), while of Jethro it is said: Call him that he may eat bread (Exod. 2:20). It is written about Esau: And he feared not God (Deut. 25:18), but about Jethro it is written: And thou shalt provide out of all the people, able men, such as fear God (Exod. 18:21). It is stated about Esau that he abolished the sacrifices (when Rome destroyed the Second Temple), but of Jethro it is said: And Jethro, Moses’ father-in-law, took a burnt-offering and sacrifices (ibid., v. 12). Esau heard of their troubles and attacked them, as it is said: Because of the striving of the children of Israel, and because they tried the Lord (ibid. 17:7), and it is written elsewhere: And Amalek came. However, when Jethro heard about Israel’s goodness, he joined them, as it is said: Now Jethro heard.

(Ib. 2, 16) All thy enemies open their mouth wide against thee. Rabba said in the name of R. Jochanan: "Why is the letter Peh placed before the letter Ayen? Because of the spies, who said with their mouths what they had not seen with their eyes." They do not call on the Lord. Rab said: "This refers to the judges." And Samuel said: "This refers to the teachers of children who are doing their work faithlessly."