12 But when this priest had offered for all time one sacrifice for sins, he sat down at the right hand of God,

Read Hebrews 10:12 Using Other Translations

But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;
But when Christ had offered for all time a single sacrifice for sins, he sat down at the right hand of God,
But our High Priest offered himself to God as a single sacrifice for sins, good for all time. Then he sat down in the place of honor at God’s right hand.