Yes, excellent passages.
Leading to another question:
If a Christian's beliefs are not founded upon the Word of God, i.e. the Bible, what are they founded upon?
A man teaching from the Word is still only a man. We are instructed to test everything.
2 Peter 2
:But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.2 And many shall follow their pernicious ways; by reason of whom the way of truth shall be evil spoken of.
Jude4 For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ.