Matthew 27:52

and the tombs were opened; and many bodies of the sleeping saints arose;

1 Corinthians 15:20

But now Christ is risen from the dead, the firstfruit of them that slept.

1 Thessalonians 4:14

For if we believe that Jesus died and is risen, so also will God bring with him those who sleep in Jesus.

John 5:25-29

Truly, truly, I say unto you, that the hour cometh and now is, when the dead will hear the voice of the Son of God; and having heard will live.

Acts 7:60

And putting down his knees, he cried with a loud voice, Lord, do not impute this sin to them. And saying this, he fell asleep.

1 Corinthians 11:30

Therefore many among you are weak and sickly, and not a few sleep.

1 Corinthians 15:51

Behold, I speak to you a mystery: We shall not all sleep, but we shall all be changed,

1 Thessalonians 5:10

the one having died for us, in order that, whether we are awake or asleep, we shall at the same time 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, I say unto you, that the hour cometh and now is, when the dead will hear the voice of the Son of God; and having heard will live.
1 Corinthians 15:20
But now Christ is risen from the dead, the firstfruit of them that slept.

Slept

1 Corinthians 11:30
Therefore many among you are weak and sickly, and not a few sleep.
1 Corinthians 15:51
Behold, I speak to 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 is risen, so also will God bring with him those who sleep in Jesus.
1 Thessalonians 5:10
the one having died for us, in order that, whether we are awake or asleep, we shall at the same time live with him.

General references

Mark 15:38
And the veil of the temple was rent in twain from top even to the bottom.
Luke 19:40
and He responding said to them, I say unto you, that if these may keep silent, the rocks will cry out.