The answer is: Sin

Lev 4:6 - The sprinkling of blood symbolized purification and atonement.

When discussing the act of sprinkling blood seven times in Leviticus, it's interesting to reflect on the deeper meaning behind this ritual. In ancient Israel, the act of purification wasn't simply about the physical act itself but was rich with symbolic significance. Blood sacrifices played an essential role in the religious and communal life of the Israelites, believed to bring about reconciliation between the people and God.

The imagery of seven could evoke the idea of completeness, much like in the creation narrative where God formed the world in six days and rested on the seventh. This custom reflects a belief that atonement required thoroughness and a total cleansing of sinful actions.

This concept isn't unique to Leviticus; various cultures and religions view blood as a purifying element. For instance, in many ancient Near Eastern contexts, blood offerings were commonplace for appeasing deities or asserting rights over property and community.

Additionally, exodus and redemption echo throughout the biblical narrative. The Israelites' past was intimately woven with sacrificial practices—in rituals that continuously reminded them of the need for repentance and the importance of living in harmony with God and each other.

Lastly, the number seven in biblical literature often represents God's divine perfection, showing how essential it is to approach the theme of atonement with reverence and complete devotion—a thread that can be recognized throughout different portions of Scripture. Feel free to explore that connection as you read on!