To this feast the people sat down according to their tribes. They ate, drank and were merry, while Aaron and Jethro with their relatives sang songs of thanksgiving to God, and praised Him as the Creator and Donor of their lives and their liberty. At the same time they gave due appreciation to Moses, through whose courage everything had happily come to pass. In his words of gratitude to Moses, Jethro also gave expression to many glorious eulogies on the people of Israel, but he especially extolled Moses, who through difficulties and dangers had shown so much courage in the salvation of his friends.
Jethro — Aaron in the Days of Moses
Legends of the Jews 1:140