Luke 24:37

but they were in a consternation and fright, imagining, that they saw a spirit.

Matthew 14:26-27

the disciples seeing him walking on the sea, cry'd out in a fright, an apparition; and they scream'd for fear.

Mark 6:49-50

when they saw him walking upon the sea, they thought it was an apparition,

Luke 16:30

no, father Abraham, said he, they will not: but if any of the dead went to them, they will certainly repent.

Acts 12:15

are you mad? said they. but she persisting that it was even so, they reply'd, it is then his angel.

Treasury of Scripture Knowledge

Summary

But they were terrified and affrighted, and supposed that they had seen a spirit.

Bible References

General references

Luke 16:30
no, father Abraham, said he, they will not: but if any of the dead went to them, they will certainly repent.
Matthew 14:26
the disciples seeing him walking on the sea, cry'd out in a fright, an apparition; and they scream'd for fear.
Mark 6:49
when they saw him walking upon the sea, they thought it was an apparition,
Acts 12:15
are you mad? said they. but she persisting that it was even so, they reply'd, it is then his angel.