'Unadulterated' in the Bible

Therefore, let us celebrate the feast, not with old leaven, nor with leaven of vice and malice and wickedness, but with the unleavened bread of sincerity and [untainted] truth.

And in all things show yourself to be an example of good works, with purity in doctrine [having the strictest regard for integrity and truth], dignified,

Like newborn infants, desire the pure spiritual milk, so that you may grow by it for your salvation,