1 Corinthians 5:8
We are generally familiar with the word "truth," the same word that appears in John 17:17, "Your word is truth." This word is used in a number of ways in the New Testament. It can mean "genuine" or "real or reality" as opposed to mere appearance. In John 17:17, it is used in the sense of something derived from a pure and holy God that declares the will of God, as compared to that which is from the world, which is sullied by the experiences of men.
Here in I Corinthians 5, it is used in the sense of truth in conduct. In other words, the truth has been taken in by means of words, believed, then been put into practice. "Truth" in the Greek is very similar to sincerity, which precedes it, and is contrasted with malice and wickedness, which are works of the flesh. The word translated sincerity means "pure or clear." The English word "sincere" is an accurate translation of the Greek word. Sincere comes from the Latin and means "without wax," implying that nothing at all contaminates it. It describes behavior that is not contaminated. The word of God in I Corinthians 5:7 has been imbibed by the person, and it has resulted in a pure, sincere, realistic, and genuine behavior or conduct.
The connections there are obvious. As surely as strength and vitality falls on the heels of eating the right kind of food, so does the vitality of the mind—that is, by the Word of God the life of God in us is strengthened so we can grow into an adult. Eating unleavened bread is symbolic of eating the pure and unadulterated Word of God, which is spirit. That spirit, in turn, becomes the basis for thinking within new parameters—parameters that always take God into account.
John W. Ritenbaugh
Freedom and Unleavened Bread