מדרש על צפניה 3:9

The Holy One, blessed be He, said: In this world My creatures opposed Me, and therefore they were divided into seventy languages because of the evil inclination, but in the world-to-come they will all be of one accord, calling upon My name and serving Me, as it is said: For then will I turn to the peoples one pure language that they may call upon the name of the Lord, to serve Him with one consent (Zeph. 3:9). And He will remove the oppression of idolatrous nations from Israel, and they shall serve Him with gladness, as it is said: Serve the Lord with gladness (Ps. 100:2). However, the nations of the world will serve Him, as is appropriate for them, with trepidation. For example, when a son serves his father, he does so in gladness, saying to himself: If I should commit an error in my father’s presence, he will not be angry with me, for he loves me. Hence he serves him with gladness. However, when a stranger serves a master, he does so with trepidation, saying to himself: If I should commit an error in his presence, he will become angry with me. Therefore, he serves him with trepidation.

{Another interpretation of} (Gen. 11:7:) COME, LET US DESCEND [AND CONFOUND THEIR LANGUAGE THERE].¹¹⁴Tanh., Gen. 2:19. When the Holy One mixed up their language, not one of them knew his companion's language. What was that language which they had been speaking? It was the holy language through which the world had been created. In this world nations and peoples take issue with the Holy One, but in the world to come all of them will be like a single shoulder for serving him. Thus it is stated (in Zeph. 3:9): FOR THEN I WILL TURN OVER TO THE PEOPLES A PURE LANGUAGE [FOR ALL OF THEM TO INVOKE THE NAME OF THE LORD, TO SERVE HIM WITH A SINGLE SHOULDER (i.e., with one accord)]. Why? Because the Holy One spoke thus to Israel: I will abolish oppression from you, destroy the nations on your account, and bring you near me so that you may serve me with fear. And again the Holy Spirit said through David (in Ps. 2:11): SERVE THE LORD WITH FEAR.

Our masters have said: All the Egyptian women's children whom Sarah suckled, all of them became proselytes; and do not be surprised at the news. So you find the following in the case of Eliphaz ben Esau (of Gen. 36:10f.; I Chron. 1:35f.): Because he grew up in the bosom of Isaac, he became righteous and was worthy of having the Holy Spirit rest (Sharah) ¹⁴⁰In an unvocalized text the verb could be read as (Sarah). upon him. Thus it is stated (in Prov. 11:30): THE FRUIT OF THE RIGHTEOUS IS A TREE OF LIFE. R. Eleazar {bar Simeon} was the son of R. Simeon ben Johay.¹⁴¹Cf. BM 85a; also PRK 11:22. R. Jose ben Halafta saw him. He said to him: You stem from a root of righteous people, but you are not a Torah scholar. He said to him: Then what should I do? He said to him: Do you want to learn? He said: Yes. He began teaching him one chapter, then a second, then a third. They brought him to the academy. Rabbi (Judah the Prince) saw him. He said to him: Have you brought this one with you? He said to him: He comes from the trunk of R. Simeon ben Johay. R. Jose brought him up to Sepphoris and instructed him. The next year he brought him down with him and entered the academy. When he began to give answers there, our holy master (Rabbi Judah the Prince) applied < Prov. 11:30 > to him: THE FRUIT OF THE RIGHTEOUS IS A TREE OF LIFE.¹⁴²I.e., a line of righteous people. Who caused him to become a Torah scholar? Was it not through R. Jose ben Halafta? Similarly in the case of the children who nursed from our mother Sarah, all of them became proselytes. The Holy One said: In this world individuals have become proselytes through the righteous ones, but in the world to come I will draw near the righteous and bring them under the wings of the Divine Presence. Thus it is stated (in Zeph. 3:9): FOR THEN WILL I MAKE THE PEOPLES PURE OF SPEECH, SO THAT THEY ALL MAY INVOKE THE LORD BY NAME AND SERVE HIM WITH ONE ACCORD.