Exodus 18:2
18:2 Then Jethro, Moses' father in law, took Zipporah, Moses'
     wife, after he had {a} 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,
         Exodus 4:25.

Exodus 18:5
18:5 And Jethro, Moses' father in law, came with his sons and
     his wife unto Moses into the wilderness, where he encamped
     at the {b} mount of God:

     (b) Horeb is called the mount of God, because God did many
         miracles there. So Peter calls the mount where Christ
         was transfigured, the holy mount: for by Christ's
         presence it was holy for a time, 2 Peter 1:18.

Exodus 18:6
18:6 And he {c} said unto Moses, I thy father in law Jethro am
     come unto thee, and thy wife, and her two sons with her.

     (c) That is, he sent messengers to say to him.

Exodus 18:10
18:10 And Jethro said, {d} Blessed [be] the LORD, who hath
      delivered you out of the hand of the Egyptians, and out of
      the hand of Pharaoh, who hath delivered the people from
      under the hand of the Egyptians.

      (d) By this it is evident that he worshipped the true God,
          and therefore Moses did not refuse to marry his
          daughter.

Exodus 18:11
18:11 Now I know that the LORD [is] greater than all gods: for
      in the thing wherein they dealt proudly {e} [he was] above
      them.

      (e) For they that drowned the children of the Israelites,
          perished themselves by water.

Exodus 18:12
18:12 And Jethro, Moses' father in law, took a burnt offering
      and sacrifices for God: and Aaron came, and all the elders
      of Israel, to eat bread with Moses' father in law {f}
      before God.

      (f) They ate in the place, where the sacrifice was
          offered: for part was burnt, and the rest eaten.

Exodus 18:15
18:15 And Moses said unto his father in law, Because the people
      come unto me to enquire of {g} God:

      (g) That is, to know God's will, and to have justice
          executed.

Exodus 18:19
18:19 Hearken now unto my voice, I will give thee counsel, and
      God shall be with thee: Be thou for the people to {h}
      God-ward, that thou mayest bring the causes unto God:

      (h) You judge in difficult cases, which cannot be decided
          without consulting with God.

Exodus 18:21
18:21 Moreover thou shalt provide out of all the people {i} able
      men, such as fear God, men of truth, hating covetousness;
      and place [such] over them, [to be] rulers of thousands,
      [and] rulers of hundreds, rulers of fifties, and rulers of
      tens:

      (i) What manner of men ought to be chosen to bear office.

Exodus 18:24
18:24 So Moses {k} hearkened to the voice of his father in law,
      and did all that he had said.

      (k) Godly counsel should always be obeyed, even if it
          comes from our inferiors, for to such God often gives
          wisdom to humble those that are exalted, and to
          declare that one member has need of another.

Exodus 18:27
18:27 And Moses {l} let his father in law depart; and he went
      his way into his own land.

      (l) Read Numbers 10:29.