6 Bible Verses about Atonement, Made Once

He does not need to offer up [animal] sacrifices every day like those head priests did [Note: The head priest here is represented as being in charge of the daily sacrifices offered by the other priests], first for His own sins and then for the people's sins. For He did this once for all time when He offered up Himself [on the cross].

For Christ did not enter the Holy of Holies made by hand, which is [only] a counterpart of the true one, but into heaven itself, where He now appears in God's presence for us. [See verse 12]. Nor was it necessary for Him to offer Himself [to God] often, like the head priest does, who enters the Holy of Holies year after year with blood that belongs to others [i.e., the blood of animal sacrifices]. For then He would have had to suffer often since the creation of the world; but now at the end of the ages [i.e., the final period of world history] He has been revealed once [for all] to remove sin by sacrificing Himself.read more.
And just as it is destined for people to die one time, and [then] after that to be judged, so Christ also, who was once [for all] offered [as a sacrifice] to take away the sins of many people, will come back a second time, not to take away sin, [but] to provide salvation to those who are waiting for Him.

By [Christ doing] what God wanted, we have been set aside for God through Jesus Christ offering His body once for all time.

But when this Priest [i.e., Christ] had offered one sacrifice for sins for all time, He sat down at the right side of God.

For by one offering [i.e., the sacrifice of Himself], Christ has made perfect forever those people who are being set apart for God.

For Christ suffered once for people's sins [to be forgiven]. [It was the case of] a righteous Man suffering for unrighteous people, so that He could bring you [or, "us"] to God [for salvation]. [Though] He [i.e., Jesus] was put to death physically, He was brought back to life by the Holy Spirit [Note: Some translations say "in spirit"].