The revelation at Mount Sinai culminates in a striking, symbolic ceremony forging a covenant between God and the Israelites. At the heart of this ritual is blood, representing life itself, which is divided into two parts to create an absolute and unbreakable bond between the two parties. Moses takes the second half of the blood that remained in the basins, the first half having already been placed upon the altar [אבן עזרא, רלב״ג, קאסוטו]. He then performs a gentle sprinkling meant to purify, rather than a forceful throwing of the liquid [רש״י, מזרחי, גור אריה].
A rich discussion emerges among commentators regarding how this sprinkling upon the people practically took place. One approach suggests the blood was applied physically to the Israelites. Because it would be impossible to reach millions of individuals, the blood was sprinkled either on the elders who represented the entire nation [אבן עזרא, רלב״ג, ביאור יש״ר] or on the twelve pillars standing for the tribes [קאסוטו]. Some interpret this physical application to mean the blood was sprinkled directly onto their clothing, similar to the inauguration of Aaron the High Priest. This bloodstain was viewed as a profound honor and a tangible testament to their entry into the covenant, serving as a spiritual ornament that the people were tragically forced to remove later following the sin of the Golden Calf [רבנו חננאל, רבנו בחיי]. A second perspective softens this physical description, suggesting the blood was not applied directly to their bodies or clothes, but was simply cast into the air in their direction [רבנו בחיי, רש ר הירש].
In contrast to these physical interpretations, a third major approach, drawing upon the Aramaic translations, departs from the literal reading entirely. This view maintains that the blood was never sprinkled toward the people, but rather upon the altar to atone for them. The altar effectively served as the Israelites' proxy to receive the blood and the covenant. Commentators note that the translators intentionally altered the literal meaning to prevent non-Jews from mocking the Torah and its rituals [שד״ל, רש״י, העמק דבר, פרדס יוסף].
While ancient covenants were typically formed by dividing an object in two, the specific use of blood rather than animal parts conveys a dual message about the nature of this agreement. On one hand, it serves as a stern warning that if the Israelites fail to uphold the Torah, their own blood could be forfeit [חזקוני, בכור שור, הדר זקנים, רבנו חננאל]. On the other hand, the blood symbolizes profound love, partnership, and unity. Much like a shared meal between loved ones, the nation is metaphorically eating from God's table. This shared blood weaves their relationship with God into the very fabric of their identity. The covenant reflects complete reciprocity; any strength a person dedicates to fulfilling God's will is ultimately returned to them [שד״ל, רש ר הירש, חומש קה״ת].
Furthermore, this event serves as the foundational model for the Israelites' formal conversion. Entering the covenant required circumcision, the bringing of sacrifices, and immersion in water. The very act of sprinkling blood proves that the people had already immersed in water, as religious law dictates that sprinkling cannot take place without prior immersion. This covenant of the Torah holds an importance equal to the covenant of circumcision established by Abraham [רלב״ג, תורה תמימה, הדר זקנים, נתינה לגר]. Ultimately, the agreement is sealed upon the foundation of absolute, unconditional acceptance of all the Commandments and words written in the book of the covenant that Moses had read to the nation [שד״ל, קאסוטו, חומש קה״ת].