Moses went out... And did obeisance. — Oriental etiquette required the going forth to meet an honoured guest (Genesis 18:2; Genesis 19:1, &c). The obeisance was wholly voluntary, and marks the humility of Moses, who, now that he was the prince of his nation, might well have required Jethro to bow down to him.
And kissed him. — Kissing is a common form of salutation in the East, even between persons who are in no way related. Herodotus says of the Persians: “When they meet each other in the streets, you may know if the persons meeting are of equal rank by the following token: if they are, instead of speaking they kiss each other on the lips. In the case where one is a little inferior to the other, the kiss is given on the cheek” (Book i. 134). (Comp. 2 Samuel 15:5; 2 Samuel 19:39; 2 Samuel 20:9; Matthew 26:48-49; Acts 20:37, &c.; and for the continuance of the custom to the present day, see the collection of instances given in the article Kiss, in Smith’s Dictionary of the Bible, vol. ii., p. 46.)
They asked each other of their welfare. — Heb., wished peace to each other — exchanged, that is, the customary salutation, “Peace be with you.”