“For then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself.”
King James Version (KJV)
9:26 For then he must often have suffered from the foundation of the world - This supposes, That by suffering once he atoned for all the sins which had been committed from the foundation of the world. That he could not have atoned for them without suffering. At the consummation of the ages - The sacrifice of Christ divides the whole age or duration of the world into two parts, and extends its virtue backward and forward, from this middle point wherein they meet to abolish both the guilt and power of sin.
Heb 9:26 For then must he often have suffered. In that case he must have suffered many times. But now once. Only once did he offer sacrifice, viz., himself. In the end of the world. At the end of the Jewish dispensation; literally, "the end of the ages", the end of the antediluvian and Jewish ages.