'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 babies [you should] long for the pure milk of the word, so that by it you may be nurtured and grow in respect to salvation [its ultimate fulfillment],