And when Phinehas, the son of Eleazar, the son of Aaron the priest, saw it, he rose up from among the congregation, and took a javelin in his hand;Numbers 25:7 Parallel Commentaries

How those that are at Variance and those that are at Peace are to be Admonished.
(Admonition 23.) Differently to be admonished are those that are at variance and those that are at peace. For those that are at variance are to be admonished to know most certainly that, in whatever virtues they may abound, they can by no means become spiritual if they neglect becoming united to their neighbours by concord. For it is written, But the fruit of the Spirit is love, joy, peace (Gal. v. 22). He then that has no care to keep peace refuses to bear the fruit of the Spirit. Hence Paul …
Leo the Great—Writings of Leo the Great

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