Adam Clarke on Isaiah 56:10

His watchmen are blind - Kimchi observes, "The flock is intrusted to the care of these watchmen. The wild beasts come; these dogs bark not; and the wild beasts devour the flock. Thus they do not profit the flock. Yea, they injure it; for the owner trusts in them, that they will watch and be faithful; but they are not. These are the false teachers and careless shepherds."

Dumb dogs, they cannot bark - See note on Isa 62:6.

Sleeping "Dreamers" - הזים hozim, ενυπνιαζομενοι, Septuagint. This seems to be the best authority for the meaning of this word, which occurs only in this place: but it is to be observed, that eleven MSS. of Kennicott's and De Rossi's, and four editions, have חזים chazim, seers, or those who see; and so the Vulgate seems to have read, videntes vana, "seeing vain things."

Loving to slumber - לנום lanum: but six of Kennicott's and seven of De Rossi's MSS. read לנוס lanus, to fly, "to change their residence:" but what connection such reading can have with the sense of the passage, I cannot discern. What is taken for ס samech here is, I have no doubt, a narrow formed final ם mem, which has been mistaken for the above. Many instances occur in my own MSS., where the final ם mem is similar to the samech; and yet no such change was intended by the scribe.