‏ Leviticus 22:3

3Say to them and to their posterity: Every man of your stock, who approaches toward those things which have been consecrated, and which the sons of Israel have brought forward to the Lord, in whom there is uncleanness, shall perish before the Lord. I am the Lord.
22:3 Approaches, etc: This is to give us to understand, with what purity of soul we are to approach to the blessed sacrament of which these meats that had been offered in sacrifice were a figure.(Challoner)
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