Young donkeys
In Isaiah 30:6, a young donkey signifies knowledges of particulars. (Arcana Coelestia 2781)
In Genesis 49:11, this signifies the natural truth of the external spiritual church, also rational truth of the internal spiritual church. (Arcana Coelestia 2781[5])
In Matthew 21:5, the Lord's riding on a colt or foal of a donkey signifies the natural and rational made subordinate. (Arcana Coelestia 2781[8])
Zechariah 9:9-10
9
Rejoice greatly, daughter of Zion! Shout, daughter of Jerusalem! Behold, your King comes to you! He is righteous, and having salvation; lowly, and riding on a donkey, even on a colt, the foal of a donkey.
10
I will cut off the chariot from Ephraim, and the horse from Jerusalem; and the battle bow will be cut off; and he will speak peace to the nations: and his dominion will be from sea to sea, and from the River to the ends of the earth.