Matthew 27:52

and the graves opened, and many bodies of departed saints arose,

1 Corinthians 15:20

But now Christ is risen from the dead, and is become the first-fruits of them that slept:

1 Thessalonians 4:14

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

John 5:25-29

Verily, verily I tell you, that the time is coming, and even now is, when the dead shall hear the voice of the Son of God, and they that hear shall live.

Acts 7:60

And bending his knees, he cried with a loud voice, Lord, lay not this sin to their charge. And when he had said this he fell asleep.

1 Corinthians 11:30

For this many among you are weak and infirm, and several are fallen asleep.

1 Corinthians 15:51

Behold, I tell you a mystery: we shall not all sleep; but we shall all be changed in a moment,

1 Thessalonians 5:10

who died for us, that whether we be awake, or asleep, 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 tell you, that the time is coming, and even 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 Christ is risen from the dead, and is become the first-fruits of them that slept:

Slept

1 Corinthians 11:30
For this many among you are weak and infirm, and several are fallen asleep.
1 Corinthians 15:51
Behold, I tell you a mystery: we shall not all sleep; but we shall all be changed in a moment,
1 Thessalonians 4:14
for if we believe that Jesus died and rose again, so also those, that sleep in Jesus, will God bring with Him.
1 Thessalonians 5:10
who died for us, that whether we be awake, or asleep, we may live together 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 answered them, I tell you, that if these were silent, the very stones would cry out.