John 15:4-6

Abide therefore in me, and I will abide in you: for as the branch cannot bear fruit of it self, unless it abide in the vine; so neither can ye, except ye abide in me.

Acts 11:23

Who, when he was come, and saw the grace of God, rejoiced, and exhorted them all with steadiness of heart to adhere to the Lord.

Acts 27:31

Paul said to the centurion, and to the soldiers, Unless these men stay in the ship ye cannot be saved.

Hebrews 3:14

for we are made partakers of Christ, if we hold fast our first confidence firm unto the end; inasmuch as it is said,

Hebrews 6:4-8

who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the holy Spirit,

Hebrews 9:11-12

But Christ being come an high-priest of the good things to come, hath entered once for all into the holy places, through a greater and more perfect tabernacle, not made with hands, that is, not of this building,

Hebrews 9:15-17

And on this account He is the mediator of a new covenant, that undergoing death for the redemption of transgressions against the first covenant, they that are called might receive the promise of an eternal inheritance.

Hebrews 10:26-30

For if we sin wilfully after having received the knowledge of the truth, there remaineth no more sacrifice for sins;

Hebrews 10:39

But we are not of those who withdraw to perdition; but of them that 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 therefore in me, and I will abide in you: for as the branch cannot bear fruit of it self, unless it abide in the vine; so neither can ye, except ye abide in me.
Acts 11:23
Who, when he was come, and saw the grace of God, rejoiced, and exhorted them all with steadiness of heart to adhere to the Lord.
Acts 27:31
Paul said to the centurion, and to the soldiers, Unless these men stay in the ship ye cannot be saved.
Hebrews 3:14
for we are made partakers of Christ, if we hold fast our first confidence firm unto the end; inasmuch as it is said,
Hebrews 6:4
who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the holy Spirit,
Hebrews 10:26
For if we sin wilfully after having received the knowledge of the truth, there remaineth no more sacrifice for sins;

After the death

Hebrews 9:11
But Christ being come an high-priest of the good things to come, hath entered once for all into the holy places, through a greater and more perfect tabernacle, not made with hands, that is, not of this building,