Hebrews 9:26

9:26 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.

Hebrews 11:4

11:4 By faith Abel offered God a greater sacrifice than Cain, and through his faith he was commended as righteous, because God commended him for his offerings. And through his faith he still speaks, though he is dead.