We can see in the old testament, how the priests had to offer daily their sacrifices and offerings for the sins committed by the people, but the word says that such sacrifices could not take away the sins, because the blood of bulls and goats were not enough .
But Jesus Christ Himself offered Himself as a perfect offering to sanctify us once and for all, and made the sanctified perfect (Hebrews 10: 6).

This new pact consists of:

• Have the laws of God in our hearts.
• Have the laws of God in our minds.
• God will no longer remember our sins.

The old covenant consisted of the purification of the meat executed by the priests.
But in the new covenant the hearts of bad conscience are purified, through the High Priest our Lord Jesus Christ.