Beloved, salvation is clearly a question of “do” or “done.” A large majority of religious clergymen say that you must do, do, do, do, to be saved. But God’s Word says that “it” is already done, and let God be true and every man a liar. Hebrews chapter 10 has a good deal to say about this truth:
“And every priest [the Old Testament priests] standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins: But this Man, after He had offered one sacrifice for sins forever, sat down on the right hand of God; From henceforth expecting till His enemies be made His footstool. For by one offering He hath perfected for ever them that are sanctified” (Heb. 10:11-14).
The tabernacle and the temple had pieces of furniture–a table of shewbread, a golden altar, a golden candlestick, and the Ark of the Covenant. There was no chair for the priest to rest upon. “Every priest standeth daily ministering and offering, oftentimes the same sacrifices, which can never take away sin.” Why? Because his work was never done.
You can be as religious as you please every day of your life, and you can work as hard as you please, but you will never, never finish your task of saving yourself. It was Christ alone who finished the work of salvation for man. It was the Creator who died for the creature’s sin.
As He yielded up His spirit to His Father, He cried out that great word “FINISHED.” It is done! (John 19:30). source