Deuteronomy 16:16 Three times in a year shall all thy males appear before the Lord thy God in the place which he shall choose; in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles: and they shall not appear before the Lord empty:

Continuing on with the issues of yeast; have you ever cut into a loaf of bread only to find a gaping cavity where the yeast has cause an area void of bread? It is not seen from the outside but there is any emptiness inside. Sin creates an emptiness within us. Many of us who have come to Christ felt that emptiness and longed for something of substance to fill the void. God did that.

Exodus 35:31 And he hath filled him with the spirit of God, in wisdom, in understanding, and in knowledge, and in all manner of workmanship;

That nature of sin can work itself in a Christian if sin isn’t dealt with in our lives. It is one of the forms of chastening, one that indicates we have gone too long without repentance and confession. That emptiness does not appear suddenly like a bloating, but rises slowly like yeast. Lacking any outward signs, a thorough inner examination is warranted.

Psalm 139:23-24 Search me, O God, and know my heart: try me, and know my thoughts: And see if there be any wicked way in me, and lead me in the way everlasting.