Luke 9:36

When the voice ceased, they found themselves alone with Jesus. And in those days they kept silence and told nobody anything of what they had seen.

Matthew 17:9

As they went down the hill Jesus ordered them, "Tell this vision to nobody until the Son of man is raised from the dead."

Mark 9:6

(for he did not know what to say, they were so terrified).

Mark 9:9-10

As they went down the hill, he forbade them to tell anyone what they had seen, till such time as the Son of man rose from the dead.

Treasury of Scripture Knowledge

Summary

And when the voice was past, Jesus was found alone. And they kept it close, and told no man in those days any of those things which they had seen.

General references

Bible References

And they

Matthew 17:9
As they went down the hill Jesus ordered them, "Tell this vision to nobody until the Son of man is raised from the dead."
Mark 9:6
(for he did not know what to say, they were so terrified).

General references

Mark 9:8
And suddenly looking round they saw no one there except Jesus all alone beside them.