Arcana Coelestia #9597
9597. 'With cherubs' means the Lord's watchfulness, guarding it from the approach of the hells and the harm they can do. This is clear from the meaning of 'cherubs' as watchfulness and providence, preventing any approach to the Lord except through good and protecting from harm the good from the Lord which exists in heaven and with man, dealt with in 9509, consequently guarding heaven from the approach of the hells and the harm they can do.
Isaiah 32:12-14
12
Beat your breasts for the pleasant fields, for the fruitful vine.
13
Thorns and briars will come up on my people's land; yes, on all the houses of joy in the joyous city.
14
For the palace will be forsaken. The populous city will be deserted. The hill and the watchtower will be for dens forever, a delight for wild donkeys, a pasture of flocks;