Luke 9:36

When the voice ceased Jesus was found alone. And they held their peace, and told no one at that time about what they had seen.

Matthew 17:9

While they were going down from the mountain, Jesus laid a command on them. "Speak to no man about the vision," he said, "until after the Son of man has been raised from the dead."

Mark 9:6

(For he did not know what to say, they were so awestruck.)

Mark 9:9-10

As they came down the mountain he strictly forbade them to narrate to any one what they had seen, until after the Son of man had risen 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
While they were going down from the mountain, Jesus laid a command on them. "Speak to no man about the vision," he said, "until after the Son of man has been raised from the dead."
Mark 9:6
(For he did not know what to say, they were so awestruck.)

General references

Mark 9:8
And suddenly as they looked around, they saw no one any more beside them, but Jesus alone.