וַיָּבֹ֞א יִתְר֨וֹ חֹתֵ֥ן מֹשֶׁ֛ה וּבָנָ֥יו וְאִשְׁתּ֖וֹ אֶל־מֹשֶׁ֑ה אֶל־הַמִּדְבָּ֗ר אֲשֶׁר־ה֛וּא חֹנֶ֥ה שָׁ֖ם הַ֥ר הָאֱלֹהִֽים׃
И Джетро, Моисей'тесть со своими сыновьями и женой пришел к Моисею в пустыню, где он находился, на гору Божию;
Mekhilta DeRabbi Yishmael
(Exodus 18:5) "and Yithro, Moses' father-in-law, and his sons and his wife came to Moses": Now is it not already written (Ibid. 6) "and your wife and her two sons with her"? — I might think that these were her sons from another. It is, therefore, written "and his sons and his wife came to Moses": They were Moses' sons and not another's.
Midrash Tanchuma Buber
(Exod. 18:5–6:) NOW JETHRO, MOSES' FATHER-IN-LAW CAME…. AND HE SAID UNTO MOSES: I AM YOUR FATHER-IN-LAW…. Who said to Moses: I AM YOUR FATHER-IN-LAW? He was unable to come to Moses. What did he do? He wrote a letter and tied it on an arrow. Then he shot, and the arrow came to Moses. Moses read it and went out to him, as stated (in vs. 7): SO MOSES WENT OUT TO MEET JETHRO. He entered the camp along with him. What is written (in vs. 12)? AND AARON CAME WITH ALL THE ELDERS OF ISRAEL TO EAT BREAD <BEFORE THE LORD WITH MOSES' FATHER-IN-LAW >. When they had eaten with him, he said: Give me permission to go to my <own> place. Moses said to him (in Numb. 10:32): IT SHALL BE THAT, IF YOU COME WITH US, IT SHALL COME TO PASS THAT WHATEVER GOOD THE LORD DOES FOR US WE WILL DO FOR YOU. <Jethro> said to him: I want to go and utter the Holy One's praise in my own place. Immediately (in Exod. 18:27): MOSES SENT HIS FATHER-IN-LAW AWAY…. Now when the Holy One does miracles for Israel, they praise him [and the nations of the world praise him]. Thus it is stated (in Ps. 138:4): {THESE PEOPLES} ALL THE KINGS OF THE EARTH SHALL GIVE THANKS TO YOU, [O LORD,] FOR THEY HAVE HEARD THE WORDS OF YOUR MOUTH.