לֹֽא־תִשְׁחַ֥ט עַל־חָמֵ֖ץ דַּם־זִבְחִ֑י וְלֹא־יָלִ֣ין לַבֹּ֔קֶר זֶ֖בַח חַ֥ג הַפָּֽסַח׃
Thou shalt not offer the blood of My sacrifice with leavened bread; neither shall the sacrifice of the feast of the passover be left unto the morning.
Read kabbalistic (mystical) interpretation of Exodus 34:25: and classical mystical sources.