Ezekiel 17:23

²³ upon the mountain of the height of Israel will I plant it; and it shall bring forth branches, and bear fruit, and become a noble cedar; and under it shall dwell all birds of every wing; in the shadow of the branches thereof shall they dwell.

Feathers

In Ezekiel 17:7, this signifies an abundance of external knowledges of good and truth. (Apocalypse Explained 281[2])

In Psalm 68:13, this signifies the truths of faith from spiritual good. (Arcana Coelestia 8764, Apocalypse Explained 283[4])

Feathers broadly signify spiritual good from which truth is derived.