Matthew 27:52

and the tombs were opened; and many bodies of holy men that slept, arose,

1 Corinthians 15:20

But now hath Christ risen from the dead, the firstfruits of them that have fallen asleep.

1 Thessalonians 4:14

For if we believe that Jesus died and rose again, then also will God, through Jesus, bring again with him those who have fallen asleep.

John 5:25-29

Truly, truly do I say to you, The hour is coming and now is, when the dead will hear the voice of the Son of God; and they that hear will live.

Acts 7:60

And kneeling down he cried with a loud voice, Lord, lay not this sin to their charge. And saying this, he fell asleep.

1 Corinthians 11:30

For this cause many among you are weak and sickly, and some are falling asleep.

1 Corinthians 15:51

Behold, I tell you a mystery. We shall not all sleep; but we shall all be changed,

1 Thessalonians 5:10

who died for us, that, whether we wake or sleep, we should together live with him.

Treasury of Scripture Knowledge

Summary

And the graves were opened; and many bodies of the saints which slept arose,

General references

Bible References

Many

John 5:25
Truly, truly do I say to you, The hour is coming and now is, when the dead will hear the voice of the Son of God; and they that hear will live.
1 Corinthians 15:20
But now hath Christ risen from the dead, the firstfruits of them that have fallen asleep.

Slept

1 Corinthians 11:30
For this cause many among you are weak and sickly, and some are falling asleep.
1 Corinthians 15:51
Behold, I tell you a mystery. We shall not all sleep; but we shall all be changed,
1 Thessalonians 4:14
For if we believe that Jesus died and rose again, then also will God, through Jesus, bring again with him those who have fallen asleep.
1 Thessalonians 5:10
who died for us, that, whether we wake or sleep, we should together live with him.

General references

Mark 15:38
And the veil of the temple was rent in two from the top to the bottom.
Luke 19:40
And he answering said, I tell you, that if these are silent, the stones will cry out.