Commentaries:
Jamieson, Fausset, and Brown
A lion—rather, "(The watchman) cried, I am as a lion"; so as is understood (Isaiah 62:5; Psalms 11:1). The point of comparison to "a lion" is in Revelation 10:3, the loudness of the cry. But here it is rather his vigilance. The lion's eyelids are short, so that, even when asleep, he seems to be on the watch, awake; hence he was painted on doors of temples as the symbol of watchfulness, guarding the place (Hor. Apollo) [HORSLEY].
Other Jamieson, Fausset, and Brown entries containing Isaiah 21:8:
Isaiah 21:1
Isaiah 52:8
Isaiah 62:6
Ezekiel 33:2
Daniel 5:30
Habakkuk 2:1
Revelation 12:14
 
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