Midrash su Geremia 23:23

(Ibid. 6) "And he said to Moses: I, your father-in-law, Yithro, am coming to you; and your wife and her two sons with her": R. Yehoshua says: He wrote this to him in a letter. R. Elazar Hamodai says: He sent it by messenger, writing therein: Do it for me; and if not for me, then come out for your wife. And if not, do it for her sons. R. Eliezer says: The Holy One Blessed be He said to Moses: I am the one who spoke and brought the world into being. I am the one who draws near and not the one who distances, viz. (Jeremiah 23:23) "Am I only a G d from near, says the L rd, and not a G d from far?" I am the one who drew Yithro near and did not distance him. You, too, when a man comes to you to be converted, he does so only for the sake of Heaven. You, too, draw him near and do not distance him. From here we learn that a man should distance with the left hand and draw near with the right, and not do as Elisha did to Gechazi, rejecting him with both hands.

R. Eliezer maintained that the Holy One, blessed be He, said to Moses: Moses, I am He who commanded the world to come into existence, and I am He who draws (people) near and does not keep (them away), as it is said: Am I a God near at hand, saith the Lord, and not a God afar off (Jer. 23:23); I am He who brought Jethro near and did not keep him far off, and so when a man comes to you to be converted, bring him near, do not keep him far off. Thereupon Moses went out to meet his father-in-law (Exod. 18:7). Our sages say that Moses, Aaron, Nadab, Abihu, and all the elders of Israel accompanied him. Hence it is said: The wise shall inherit honor.