Joshua 20:6

New International Version

They are to stay in that city until they have stood trial before the assembly and until the death of the high priest who is serving at that time. Then they may go back to their own home in the town from which they fled.”

Cross References

Numbers 35:12

They will be places of refuge from the avenger, so that anyone accused of murder may not die before they stand trial before the assembly.

Hebrews 9:26

Otherwise Christ would have had to suffer many times since the creation of the world. But he has appeared once for all at the culmination of the ages to do away with sin by the sacrifice of himself.