Which have forsaken the right way - The straight path of honesty and integrity. Religion is often represented as a straight path, and to do wrong is to go out of that path in a crooked way.
Following the way of Balaam the son of Bosor - See Numbers 22:5, following. In the Book of Numbers, Balaam is called the son of "Beor." Perhaps the name Beor was corrupted into Bosor; or, as Rosenmuller suggests, the father of Balaam may have had two names. Schleusner (Lexicon) supposes that it was changed by the Greeks because it was more easily pronounced. The Septuagint, however, reads it as Βεὼρ Beōr - "Beor." The meaning here is, that they IMitAted Balaam. The particular point to which Peter refers in which they imitated him, seems to have been the love of gain, or covetousness. Possibly, however, he might have designed to refer to a more general resemblance, for in fact they imitated him in the following things:
(1) in being professed religious teachers, or the servants of God;
(2) in their covetousness;
(3) in inducing others to sin, referring to the same kind of sins in both cases.
Balaam counselled the Moabites to entice the children of Israel to illicit connection with their women, thus introducing licentiousness into the camp of the Hebrews (Numbers 31:16; compare Numbers 25:1-9); and in like manner these teachers led others into licentiousness, thus corrupting the church.
Who loved the wages of unrighteousness - Who was supremely influenced by the love of gain, and was capable of being employed, for a price, in a wicked design; thus prostituting his high office, as a professed prophet of the Most High, to base and ignoble ends. That Balaam, though he professed to be influenced by a supreme regard to the will of God Numbers 22:18, Numbers 22:38, was really influenced by the desire of reward, and was willing to prostitute his great office to secure such a reward, there can be no doubt.
(1) the elders of Moab and of Midian came to Balaam with "the rewards of divination in their hand" Numbers 22:7, and with promises from Balak of promoting him to great honor, if he would curse the children of Israel, Numbers 22:17.
(2) Balaam was disposed to go with them, and was restrained from going at once only by a direct and solemn prohibition from the Lord, Numbers 22:11.
(3) notwithstanding this solemn prohibition, and not with standing he said to the ambassadors from Balak that he would do only as God directed, though Balak should give him his house full of silver and gold, Numbers 22:18, yet he did not regard the matter as settled, but proposed to them that they should wait another night, with the hope that the Lord would give a more favourable direction in reference to their request, thus showing that his heart was in the service which they required, and that his inclination was to avail himself of their offer, Numbers 22:19.
(4) when he did obtain permission to go, it was only to say that which the Lord should direct him to say, Numbers 22:20; but he went with a perverse heart, with a secret wish to comply with the desire of Balak, and with a knowledge that he was doing wrong, Numbers 22:34, and was restrained from uttering the curse which Balak desired only by an influence from above which he could not control. Balaam was undoubtedly a wicked man, and was constrained by a power from on high to utter sentiments which God meant should be uttered, but which Balaam would never have expressed of his own accord.

Which have forsaken the right way - As Balaam did, who, although God showed him the right way, took one contrary to it, preferring the reward offered him by Balak to the approbation and blessing of God.
The way of Balaam - Is the counsel of Balaam. He counselled the Moabites to give their most beautiful young women to the Israelitish youth, that they might be enticed by them to commit idolatry. See the notes on Numbers 22:5, etc., and Numbers 23:1 (note), etc.
The son of Bosor - Instead of Βοσορ, Bosor two ancient MSS. and some of the versions have Βεωρ, Beor, to accommodate the word to the Hebrew text and the Septuagint. The difference in this name seems to have arisen from mistaking one letter for another in the Hebrew name, בעור Beor, for בצור Betsor or Bosor; tsaddi צ and ain ע, which are very like each other, being interchanged.

Which have forsaken the right way,.... The right way of the Lord, the way of truth, the Gospel of truth; or Christ, who is the way, the truth, and the life; the true way to eternal life, and which is the right way to eternal happiness; the way of life, righteousness, and salvation by Christ, the Christian faith, and the doctrine of it, which they once professed, but now relinquished:
and are gone astray; from the right way, the way of truth and holiness, into the paths of error and profaneness:
following the way of Balaam the son of Bosor; which Jude calls his error, Jde 1:11, and is the path of covetousness, uncleanness, and idolatry, sins which he was either guilty of himself, or taught, advised, and seduced others to; see Revelation 2:14. The Vulgate Latin version reads "Balaam out of Bosor", taking "Bosor" for the name of a place, of which "Balaam" was; but not "Bosor", but "Pethor", was the place of Balaam's residence, Numbers 22:5. The Arabic and Ethiopic versions supply, as we do, "the son of Bosor"; and the Syriac version reads, "the son of Beor", as in Numbers 22:5; for Beor and "Bosor" are the same names; the "sheva" being pronounced by "o", as it is by "oa" in "Boanerges", and the "ain" by "s". Moreover, the letters and are sometimes used for one another, as in and and and so and especially in the Chaldean dialect; and Peter now being at Babylon in Chaldea, see 1-Peter 5:13; it is no wonder that he so pronounced.
Who loved the wages of unrighteousness: which were the rewards of divination, Numbers 22:7; which were brought him for his divining or soothsaying, and may well be called unrighteous wages, since it was for doing unrighteous things, or things in an unrighteous manner; and these he loved, desired, and greedily coveted, and fain would he have taken Balak's gold and silver, and have cursed Israel, but was restrained by the Lord: he showed a good will to it, in going along with the messengers, and in building altars, and offering sacrifice in one place after another, in which there was a great resemblance between him and the men here spoken of.

have--Some of the seducers are spoken of as already come, others as yet to come.
following--out: so the Greek.
the way-- (Numbers 22:23, Numbers 22:32; Isaiah 56:11).
son of Bosor--the same as Beor (Numbers 22:5). This word was adopted, perhaps, because the kindred word Basar means flesh; and Balaam is justly termed son of carnality, as covetous, and the enticer of Israel to lust.
loved the wages of unrighteousness--and therefore wished (in order to gain them from Balak) to curse Israel whom God had blessed, and at last gave the hellish counsel that the only way to bring God's curse on Israel was to entice them to fleshly lust and idolatry, which often go together.

The way of Balaam the son of Bosor - So the Chaldeans pronounced what the Jews termed Beor; namely, the way of covetousness. Who loved - Earnestly desired, though he did not dare to take, the reward of unrighteousness - The money which Balak would have given him for cursing Israel.