7:27 In Old Testament times when animals were sacrificed, they were cut into pieces, the parts were washed, the fat was burned, the blood was sprinkled, and the meat was boiled. Blood was demanded as atonement for sins, and God accepted animal blood to cover the people's sins (Leviticus 17:11). Because of the sacrificial system, the Israelites were generally aware that sin costs someone something and that they themselves were sinful. Many people take Christ's work on the cross for granted. They don't realize how costly it was for Jesus to secure our forgiveness--it cost him his life and painful, temporary separation from his Father (Matthew 27:46; 1 Peter 1:18, 19).
7:27 Because Jesus died once for all, he brought the sacrificial system to an end. He forgave sins--past, present, and future. The Jews did not need to go back to the old system because Christ, the perfect sacrifice, completed the work of redemption. You don't have to look for another way to have your sins forgiven--Christ was the final sacrifice for you.