John 11:13

Howbeit Jesus spake of his death: but they thought that he had spoken of taking of rest in sleep.
— John 11:13, King James Version

In other translations

World English Bible (WEB)

Now Jesus had spoken of his death, but they thought that he spoke of taking rest in sleep.

American Standard Version (ASV)

Now Jesus had spoken of his death: but they thought that he spake of taking rest in sleep.

Young's Literal Translation (YLT)

but Jesus had spoken about his death, but they thought that about the repose of sleep he speaketh.