וְֽאִם־יִוָּתֵ֞ר מִבְּשַׂ֧ר הַמִּלֻּאִ֛ים וּמִן־הַלֶּ֖חֶם עַד־הַבֹּ֑קֶר וְשָׂרַפְתָּ֤ אֶת־הַנּוֹתָר֙ בָּאֵ֔שׁ לֹ֥א יֵאָכֵ֖ל כִּי־קֹ֥דֶשׁ הֽוּא׃
And if aught of the flesh of the consecration, or of the bread, remain unto the morning, then thou shalt burn the remainder with fire; it shall not be eaten, because it is holy.
Read kabbalistic (mystical) interpretation of Exodus 29:34: and classical mystical sources.