The original covenant God had made with Abraham and later fully articulated with Moses and Aaron, was meant to be temporary. It was not perfect and required a lot of intervention from the High Priest. Hebrews 8:7 says, For if there had been nothing wrong with that first covenant, no place would have been sought for another. Jesus fixed it by becoming the perfect High Priest for us. When we have faith in Him, He automatically intercedes on our behalf. The new covenant is perfect.