1 John 2:21
I have written to you, not because you are ignorant of the truth, but because you know it, and you know that nothing false comes from the truth.
2 Peter 1:12
For this reason I shall always persist in reminding you of these things, although you know them and are stedfast believers in truth which you already possess.
Romans 15:14-15
But as to you, brethren, I am convinced-- yes, I Paul am convinced--that, even apart from my teaching, you are already full of goodness of heart, and enriched with complete Christian knowledge, and are also competent to instruct one another.
Jude 1:5
I desire to remind you--although the whole matter is already familiar to you--that the Lord saved a people out of the land of Egypt, but afterwards destroyed those who had no faith.