Numbers 35:28

for in the city of his refuge he doth dwell till the death of the chief priest; and after the death of the chief priest doth the man-slayer turn back unto the city of his possession.

John 15:4-6

remain in me, and I in you, as the branch is not able to bear fruit of itself, if it may not remain in the vine, so neither ye, if ye may not remain in me.

Acts 11:23

who, having come, and having seen the grace of God, was glad, and was exhorting all with purpose of heart to cleave to the Lord,

Acts 27:31

Paul said to the centurion and to the soldiers, 'If these do not remain in the ship -- ye are not able to be saved;'

Hebrews 3:14

for partakers we have become of the Christ, if the beginning of the confidence unto the end we may hold fast,

Hebrews 6:4-8

for it is impossible for those once enlightened, having tasted also of the heavenly gift, and partakers having became of the Holy Spirit,

Hebrews 9:11-12

And Christ being come, chief priest of the coming good things, through the greater and more perfect tabernacle not made with hands -- that is, not of this creation --

Hebrews 9:15-17

And because of this, of a new covenant he is mediator, that, death having come, for redemption of the transgressions under the first covenant, those called may receive the promise of the age-during inheritance,

Hebrews 10:26-30

For we -- wilfully sinning after the receiving the full knowledge of the truth -- no more for sins doth there remain a sacrifice,

Hebrews 10:39

and we are not of those drawing back to destruction, but of those believing to a preserving of 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
remain in me, and I in you, as the branch is not able to bear fruit of itself, if it may not remain in the vine, so neither ye, if ye may not remain in me.
Acts 11:23
who, having come, and having seen the grace of God, was glad, and was exhorting all with purpose of heart to cleave to the Lord,
Acts 27:31
Paul said to the centurion and to the soldiers, 'If these do not remain in the ship -- ye are not able to be saved;'
Hebrews 3:14
for partakers we have become of the Christ, if the beginning of the confidence unto the end we may hold fast,
Hebrews 6:4
for it is impossible for those once enlightened, having tasted also of the heavenly gift, and partakers having became of the Holy Spirit,
Hebrews 10:26
For we -- wilfully sinning after the receiving the full knowledge of the truth -- no more for sins doth there remain a sacrifice,

After the death

Hebrews 9:11
And Christ being come, chief priest of the coming good things, through the greater and more perfect tabernacle not made with hands -- that is, not of this creation --