Balaam was a soothsayer who was hired by Moab to curse Israel, yet who prayed to YHWH and was told to bless Israel instead (Numbers 22 and 23). On his way to Moab the angel of YHWH stood in his way to oppose him and Balaam and his companions had a "Road to Moab" experience. In this experience Balaam found out he was unjustly persecuting his donkey and said "I have sinned." Balaam ended up blessing Israel several times to the dismay of those who had hired him.

However, the next time we hear of Balaam, he is slain with the Midianites (Numbers 31:8). We find out why later in the chapter. Behold, these caused the children of Israel, through the counsel of Balaam, to commit trespass against YHWH in the matter of Peor, and there was a plague among the congregation of YHWH. Balaam was converted and blessed, yet fell away and caused the children of Israel "to commit trespass against YHWH" (Numbers 31:16).

We have to go to the New Testament to find out more specifically what sins were involved. Balaam is referred to in 2 Peter, Jude and Revelation. The verse with the most information is in Revelation.

Rev 2:14 But I have a few things against thee, because thou hast there them that hold the doctrine of Balaam, who taught Balac to cast a stumblingblock before the children of Israel, to eat things sacrificed unto idols, and to commit fornication.

Who in the NT could Messiah have been warning against that would be a type of Balaam? Paul unjustly persecuted Messiah, had a conversion experience on the Road to Damascus, and initially spoke the words of YHWH. We need to take this parallel further and see that Paul made statements to the effect that fornication and eating food offered to idols are "lawful" to him, yet not "expedient." This is clearly understood by mainstream Evangelical Christianity.

1Co 6:12 All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any.

1Co 8:7 Howbeit [there is] not in every man that knowledge: for some with conscience of the idol unto this hour eat [it] as a thing offered unto an idol; and their conscience being weak is defiled.
1Co 8:8 But meat commendeth us not to God: for neither, if we eat, are we the better; neither, if we eat not, are we the worse.

I fully realize that many who read this know that the Torah is not done away with and interpret Paul in that manner. However, I am saying that as Paul came with signs and wonders, we are not to automatically accept him! What I see happening is that many accept Paul's Gospel and reject the words of Messiah.

Deu 13:1 If there arise among you a prophet, or a dreamer of dreams, and giveth thee a sign or a wonder,
Deu 13:2 And the sign or the wonder come to pass, whereof he spake unto thee, saying, Let us go after other gods, which thou hast not known, and let us serve them;
Deu 13:3 Thou shalt not hearken unto the words of that prophet, or that dreamer of dreams: for YHWH your God proveth you, to know whether ye love YHWH your God with all your heart and with all your soul.

Mat 24:24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if [it were] possible, they shall deceive the very elect.

Rom 15:19 Through mighty signs and wonders, by the power of the Spirit of God; so that from Jerusalem, and round about unto Illyricum, I have fully preached the gospel of Christ.

For further reading, chapter from Jesus' Words Only.