For those lying refuges to which you trust will not be able to give you that protection and comfort which you expect from them, no more than a man can stretch himself (as these luxurious Israelites used to do, Amos 6:4) upon a bed which is too narrow for him, or wrap or keep himself warm with a covering or bed-clothes which are not large enough for him.
Related Commentaries of Isaiah 28:20
Isaiah 28:20
20 For the bed is shorter than that a man can stretch himself on it: and the covering narrower than that he can wrap himself in it.