John Lightfoot on John 11:11

[Sleepeth.] The apostles having heard the report that Lazarus was sick, and that Christ told them now that he was fallen asleep; they apprehend that the edge of the disease which had hitherto taken away all rest from him was now taken off; so that they say, "If he sleep, he shall do well": having not rightly understood the word our Saviour used. The fallacy of the word is not unpleasantly expressed in Bereshith Rabba; "Rachel said to Leah, 'He shall sleep with thee tonight,' Genesis 30:19: He shall sleep with thee, he shall not sleep with me; i.e. Thou and he shall lie together in one sepulchre, so shall not he and I."