Exodus Chapter 2, Verse 18
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18: And when they came to Reuel their father, he said, How is it
that ye are come so soon to day?
18: And hey came to Raguel their father; and he said to them, Why have ye come so quickly to-day?
In Ex 2:18 the priest is called Reguel, in Ex 3:1 Jethro. This title, "the priest of Midian," shows that he was the spiritual head of the branch of the Midianites located there, but hardly that he was the prince or temporal head as well, like Melchizedek, as the Targumists have indicated by רבא, and as Artapanus and the poet Ezekiel distinctly affirm. The other shepherds would hardly have treated the daughters of the Emir in the manner described in Ex 2:17. The name רעוּאל (Reguel, friend of God) indicates that this priest served the old Semitic God El (אל). This Reguel, who gave his daughter Zipporah to Moses, was unquestionably the same person as Jethro (יתרו) the חתן of Moses and priest of Midian (Ex 3:1).
Now, as Reguel's son Chobab is called Moses' חתן in Num 10:29 (cf. Jdg 4:11), the Targumists and others supposed Reguel to be the grandfather of Zipporah, in which case אב would mean the grandfather in Ex 2:18, and בּת the granddaughter in Ex 2:21. This hypothesis would undoubtedly be admissible, if it were probable on other grounds. But as a comparison of Num 10:29 with Exodus Chapter 18 does not necessarily prove that Chobab and Jethro were the same persons, whilst Ex 18:27 seems to lead to the very opposite conclusion, and התן, like the Greek γαμβρός, may be used for both father-in-law and brother-in-law, it would probably be more correct to regard Chobab as Moses' brother-in-law, Reguel as the proper name of his father-in-law, and Jethro, for which Jether (praestantia) is substituted in Ex 4:18, as either a title, or the surname which showed the rank of Reguel in his tribe, like the Arabic Imam, i.e., praepositus, spec. sacrorum antistes. Ranke's opinion, that Jethro and Chobab were both of them sons of Reguel and brothers-in-law of Moses, is obviously untenable, if only on the ground that according to the analogy of Num 10:29 the epithet "son of Reguel" would not be omitted in Ex 3:1.
