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])
Isaiah 30:6-7
6
The burden of the animals of the South. Through the land of trouble and anguish, of the lioness and the lion, the viper and fiery flying serpent, they carry their riches on the shoulders of young donkeys, and their treasures on the humps of camels, to an unprofitable people.
7
For Egypt helps in vain, and to no purpose; therefore have I called her Rahab who sits still.