The book of the wars of the Lord - There are endless conjectures about this book, both among ancients and moderns. Dr. Lightfoot's opinion is the most simple, and to me bears the greatest appearance of being the true one. "This book seems to have been some book of remembrances and directions, written by Moses for Joshua's private instruction for the management of the wars after him. See Exodus 17:14-16. It may be that this was the same book which is called the book of Jasher, i. e., the book of the upright, or a directory for Joshua, from Moses, what to do and what to expect in his wars; and in this book it seems as if Moses directed the setting up of archery, see 2 Samuel 1:18, and warrants Joshua to command the sun, and expect its obedience, Joshua 10:13."

What he did in the Red Sea, and in the brooks of Arnon - This clause is impenetrably obscure. All the versions, all the translators, and all the commentators, have been puzzled with it. Scarcely any two agree. The original is את והב בסופה eth vaheb besuphah, which our translators render, what he did in the Red Sea, following here the Chaldee Targum; but not satisfied with this version, they have put the most difficult words in English letters in the margin, Vaheb in Suphah. Calmet's conjecture here is ingenious, and is adopted by Houbigant; instead of והב vaheb, he reads זרד zared. Now a ז zain may be easily mistaken for a ו vau, and vice versa; and a ה he for a ר, resh, if the left limb happened to be a little obliterated, which frequently occurs, not only in MSS., but in printed books; the ב beth also might be mistaken for a ד daleth, if the ruled line on which it stood happened in that place to be a little thicker or blacker than usual. Thus then והב vaheb might be easily formed out of זרד zared, mentioned Numbers 21:12; the whole might then be read, They encamped at the brook Zared, and they came to Suphah, and thence to the brook Arnon. Take the passage as we may, it is evidently defective. As I judge the whole clause to have been a common proverb in those days, and Vaheb to be a proper name, I therefore propose the following translation, which I believe to be the best: From Vaheb unto Suph, and unto the streams of Arnon. If we allow it to have been a proverbial expression, used to point out extensive distance, then it was similar to that well known phrase, From Dan even unto Beersheba.

Ar

Numbers 21:28 For there is a fire gone out of Heshbon, a flame from the city of Sihon: it has consumed Ar of Moab...

Deuteronomy 2:9,18,29 And the LORD said to me, Distress not the Moabites, neither contend with them in battle...

Isaiah 15:1 The burden of Moab. Because in the night Ar of Moab is laid waste, and brought to silence...

lieth. Heb. leaneth

Messiah Suffering and Wounded for Us
Surely He hath borne our griefs, and carried our sorrows: ..... He was wounded for our transgressions, He was bruised for our iniquities: the chastisement of our peace was upon Him; and with His stripes we are healed. W hen our Lord was transfigured, Moses and Elijah appeared in glory and conversed with Him. Had we been informed of the interview only, we should probably have desired to know the subject of their conversation, as we might reasonably suppose it turned upon very interesting and important …
John Newton—Messiah Vol. 1

The Two Classes.
"Two men went up into the temple to pray."--Luke xvii. 10. I now want to speak of two classes: First, those who do not feel their need of a Saviour who have not been convinced of sin by the Spirit; and Second, those who are convinced of sin and cry, "What must I do to be saved?" All inquirers can be ranged under two heads: they have either the spirit of the Pharisee, or the spirit of the publican. If a man having the spirit of the Pharisee comes into an after-meeting, I know of no better portion …
Dwight L. Moody—The Way to God and How to Find It

Numbers
Like the last part of Exodus, and the whole of Leviticus, the first part of Numbers, i.-x. 28--so called,[1] rather inappropriately, from the census in i., iii., (iv.), xxvi.--is unmistakably priestly in its interests and language. Beginning with a census of the men of war (i.) and the order of the camp (ii.), it devotes specific attention to the Levites, their numbers and duties (iii., iv.). Then follow laws for the exclusion of the unclean, v. 1-4, for determining the manner and amount of restitution …
John Edgar McFadyen—Introduction to the Old Testament