His watchmen are blind: they are all ignorant, they are all dumb dogs, they cannot bark; sleeping, lying down, loving to slumber.
His watchmen - Israel's spiritual leaders (Isaiah 62:6; Ezekiel 3:17).
(Are) blind - (Matthew 23:16.)
Dumb dogs - image from bad shepherds' watch-dogs, which fail to give notice, by barking, of the approach of wild beasts ( hoziym (H1957) shokªbiym (H7901)).
Sleeping, lying down - `dreamers, sluggards' (Lowth). Not merely sleeping inactive, but under visionary delusions. [So the Septuagint, enupnizomenoi. The Vulgate, 'videntes vana;' and the Arabic].
Loving to slumber - not merely slumbering involuntarily, but loving it.