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.
Heaven and Hell #140
140. Since the Lord as the sun is divine love, and divine love is the essential divine good, the divine that emanates from him - his divine nature in heaven - is called divine truth for the sake of clarity, even though it is divine good united to divine truth. This divine truth is what is called "the holy" that emanates from him.