Matthew 27:52

and many bodies of holy men that slept were raised.

1 Corinthians 15:20

But now is Christ risen from the dead, the first-fruit of them that slept.

1 Thessalonians 4:14

For if we believe, that Jesus died and rose again, so will God bring with him those also that sleep in Christ.

John 5:25-29

Verily, verily I say unto you, The hour is coming, and now is, when the dead shall hear the voice of the Son of God, and they that hear shall live.

Acts 7:60

And kneeling down, he cried with a loud voice, Lord, lay not this sin to their charge. And having said this, he fell asleep: And Saul was consenting to his death.

1 Corinthians 11:30

For this cause many are sick and weak among you, and many sleep.

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

but to obtain salvation by our Lord Jesus Christ, Who died for us, that whether we wake or sleep, we may live together 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
Verily, verily I say unto you, The hour is coming, and now is, when the dead shall hear the voice of the Son of God, and they that hear shall live.
1 Corinthians 15:20
But now is Christ risen from the dead, the first-fruit of them that slept.

Slept

1 Corinthians 11:30
For this cause many are sick and weak among you, and many sleep.
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, so will God bring with him those also that sleep in Christ.
1 Thessalonians 5:10
but to obtain salvation by our Lord Jesus Christ, Who died for us, that whether we wake or sleep, we may live together with him.

General references

Mark 15:38
And the veil of the temple was rent in twain, from the top to the bottom.
Luke 19:40
And he answering said to them, I tell you, that if these should hold their peace, the stones would immediately cry out.