שמות, פרק כ״ג, פסוק י״ח

The sacrificial service in the Temple demands both physical precision and deep spiritual intention, particularly regarding the exact timing of the rituals. Two vital warnings govern the offering process, emphasizing that the service must be performed with promptness and complete devotion. The first addresses the environment in which a sacrifice is prepared, while the second governs the timely burning of its portions on the altar, ensuring that the act of worship remains unblemished by delay or contradiction.

The primary approach among commentators is that the initial warning focuses specifically on the Passover sacrifice. It establishes a strict rule: the sacrifice must not be slaughtered on the fourteenth of Nissan if leaven remains in the possession of the slaughterer or any member of the group registered for the offering. All leaven must be completely cleared away before the process begins. This restriction applies comprehensively to both the physical slaughtering of the animal and the subsequent pouring of its blood upon the altar [רמב״ן, רבנו בחיי, ביאור יש״ר, גור אריה, דברי דוד, נתינה לגר, שד״ל]. While most link this exclusively to the Passover offering, broader interpretations suggest it also applies to the daily offering of that afternoon [מלבי״ם]. Another perspective views this as a wider prohibition against presenting almost any sacrifice alongside leaven, serving as a deliberate rejection of ancient Canaanite practices that incorporated leaven and honey into their worship [קאסוטו].

Clearing away leaven before the sacrifice serves to spiritually prepare the nation, ensuring they approach the holiday with reverence rather than treating the commandment as a casual act [שד״ל]. Furthermore, it is fundamentally inappropriate to perform a sacred duty while simultaneously clinging to a forbidden item [שפתי כהן]. At its core, leaven symbolizes human independence and a sense of absolute ownership over physical property, whereas the Passover sacrifice represents the complete dedication of the home to God. Attempting to offer the sacrifice while keeping leaven in the home creates a profound spiritual contradiction. It reflects a willingness to dedicate one's soul, yet a stubborn refusal to submit one's physical possessions and livelihood to God [רש״ר הירש].

The subsequent warning dictates that the fats of the offering must not be left unburned until morning. Commentators differ on which specific fats are intended. Some maintain it refers strictly to the fats of the Passover sacrifice itself [אבן עזרא, רשב״ם, חזקוני], while others suggest it applies to the additional festival peace offerings brought during the holiday, as the concept of the festival inherently involves the gathering and assembling of people to share in a joint meal [העמק דבר, רלב״ג, הכתב והקבלה]. A broader view understands this as a universal rule prohibiting the delay of the fats of any sacrifice [תורה תמימה]. Practically, the restriction means the fats cannot be left waiting on the courtyard floor throughout the night. However, if they are placed upon the altar fire even a single moment before dawn, they remain valid and may continue to burn into the following day [רש״י, מזרחי, גור אריה, משכיל לדוד, נתינה לגר].

This strict timeline serves several purposes. On a practical level, it prevents laziness and irreverence. It would be deeply disrespectful to Heaven for a person to enjoy eating the meat of the sacrifice at night while leaving the altar's portion neglected until morning [שד״ל]. Additionally, ensuring the altar service concludes at night prevents the festive meal from extending until dawn, which could easily deteriorate into inappropriate revelry [קאסוטו]. On a deeper level, the sacrifice represents a complete human experience. The blood symbolizes the soul, while the fat represents physical desires, property, and material ambitions. Just as the soul is dedicated to God during the day, one's material ambitions must be committed to the altar fire that very same night, without delay. This teaches that spiritual elevation must never be separated from the sanctification of everyday physical life [רש״ר הירש]. Finally, because the sacrifice draws down divine blessing, the time of burning the fats is a profound moment of favor and prayer, making it essential to complete the process during the night [העמק דבר].