NET
26 for then he would have had to suffer again and again since the foundation of the world. But now he has appeared once for all at the consummation of the ages to put away sin by his sacrifice.
Darby
26 since he had [then] been obliged often to suffer from the foundation of the world. But now once in the consummation of the ages he has been manifested for [the] putting away of sin by his sacrifice.
KJV
26 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.