[Petrosius]

And where in the Bible does it say that our faith is to be based solely on the Bible?

[ealgeone]

14You, however, continue in the things you have learned and become convinced of, knowing from whom you have learned them, 15and that from childhood you have known the sacred writings which are able to give you the wisdom that leads to salvation through faith which is in Christ Jesus. 16All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness; 17so that the man of God may be adequate, equipped for every good work. 2 Timothy 3:14-17 NASB

Jesus appealed to the Scriptures when tempted by Satan.

"It is written" is used 60 times in the NT in an appeal to the OT Scriptures.

We have the example of the Bereans searching the Scriptures.

Mary's family was very well acquainted with the Scriptures as attested in Luke.

If the Bible is not the standard against truth is measured then we have to allow the Mormon the Book of Mormon and the Muslim the Koran.

[Old Yeller]

You shall not add to the word that I command you, nor take from it, that you may keep the commandments of the LORD your God that I command you.
Deuteronomy 4:2

Add thou not unto His words, lest He reprove thee, and thou be found a liar"
Proverbs 30:6.

I have applied all these things to myself and Apollos for your benefit, brothers,[a] that you may learn by us not to go beyond what is written, that none of you may be puffed up in favor of one against another.
1Corinthians 4:6

[metmom]

And where in the Bible does it say that our faith is to be based solely on the Bible?

The better question, a less loaded one, is whether our faith is based on SCRIPTURE.

And here....

Romans 10:17So faith comes from hearing, and hearing through the word of Christ.