John 15:4-6

Abide in Me, and I in you. As the branch cannot bear fruit of itself, unless it abide in the vine; so neither can ye, unless ye abide in Me.

Acts 11:23

who, having come, and having seen the grace of God, rejoiced, and was exhorting all that, with purpose of heart, they should cleave to the Lord;

Acts 27:31

Paul said to the centurion and to the soldiers, "Except these abide in the ship, ye cannot be saved."

Hebrews 3:14

for we have become partakers of Christ, if we hold fast the beginning of our confidence firm to the end:

Hebrews 6:4-8

For as to those who were once enlightened, and tasted of the heavenly gift, and became partakers of the Holy Spirit,

Hebrews 9:11-12

But Christ, having come as a High Priest of the good things to come, through the greater and more perfect tabernacle, not made by hand (that is, not of this creation),

Hebrews 9:15-17

And, for this cause, He is the Mediator of a new covenant, that, death having taken place for redemption from the transgressions against the first covenant, those who have been called may receive the promise of the eternal inheritance.

Hebrews 10:26-30

For, if we sin wilfully after we received the full knowledge of the truth, there no longer remains a sacrifice for sins,

Hebrews 10:39

But we are not of those who draw back to destruction; but of those who believe to the saving of the soul.

Treasury of Scripture Knowledge

Summary

Because he should have remained in the city of his refuge until the death of the high priest: but after the death of the high priest the slayer shall return into the land of his possession.

After the death

Bible References

He should

John 15:4
Abide in Me, and I in you. As the branch cannot bear fruit of itself, unless it abide in the vine; so neither can ye, unless ye abide in Me.
Acts 11:23
who, having come, and having seen the grace of God, rejoiced, and was exhorting all that, with purpose of heart, they should cleave to the Lord;
Acts 27:31
Paul said to the centurion and to the soldiers, "Except these abide in the ship, ye cannot be saved."
Hebrews 3:14
for we have become partakers of Christ, if we hold fast the beginning of our confidence firm to the end:
Hebrews 6:4
For as to those who were once enlightened, and tasted of the heavenly gift, and became partakers of the Holy Spirit,
Hebrews 10:26
For, if we sin wilfully after we received the full knowledge of the truth, there no longer remains a sacrifice for sins,

After the death

Hebrews 9:11
But Christ, having come as a High Priest of the good things to come, through the greater and more perfect tabernacle, not made by hand (that is, not of this creation),