The Lord (YHVH) commanded the grain offering on Shavuot, (known as Pentecost among Christians), to be made of the finest flour, baked with yeast, that is, leaven. Leaven, in the Bible, is almost universally, a symbol for "sin", and in the OT is strictly forbidden on the altar of YHVH., yet here, in the Feast of Weeks it is commanded as part of the offering. Just six weeks prior to this festival, Israel had spent a week eating unleavened bread, a clear picture of the connection between the Passover Lamb and the removal of sin from our lives. Now the grain offering for Shavuot contains yeast; two loaves with it. Why? A common interpretation of this for NT believers is that the loaves represent Jews and Gentiles, the two types of redeemed people, who, of course, still contain sin in our lives.
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