Messiah: No. 53 Worthy is the Lamb, Amen

I listened to Handel's Messiah recently, and I was reminded of something I'd noticed but forgot to include in my original notes, even before I re-posted them here a couple years ago.

As I pointed out, the text for No. 53 Worthy is the Lamb, Amen is from Revelation 5:12-14.  The "amen" is sung as a fugue by the four voices, and I think this is meant to represent part of verse 14:  "And the four living creatures said, 'Amen!'"  It's as if each voice (soprano, alto, tenor, and bass) is one of the four living creatures.