Now Jethro, Moses’ father-in-law, had taken Zipporah, Moses’ wife, after he had sent her home,
This incident may very well be allowed to have happened as it is placed here, before the giving of the law, and not, as some place it, in connection with what is recorded, Num 10:11, Num 10:29, etc. Sacrifices were offered before; in these mentioned here (Exo 18:12) it is observable that Jethro is said to take them, not Aaron.
Commenting on Exodus 18:1-6
Then Jethro, Moses's father-in-law, took Zipporah, Moses's wife,.... When he had heard of the above things, he determined to pay Moses a visit, and congratulate him on that account; and he took his daughter, the wife of Moses, along with him, to deliver her to her husband, to share with him in his cares and troubles; as to partake with him of his honours and...
Then Jethro, Moses' father in law, took Zipporah, Moses' wife, after he had sent her back, (a) It may seem that he sent her back for a time to her father for her impatience, lest she should be a hinderance to his calling, which was so dangerous, .