Arcana Coelestia #486
486. Verse 4 And the days of Man after he beget Seth were eight hundred years; and he beget sons and daughters.
'Days' means periods of time and states in general. 'Years' means periods of time and states in particular. 'Sons and daughters' means the truths and goods that they perceived.
Numbers 27:15-17
15
Moses spoke to Yahweh, saying,
16
"Let Yahweh, the God of the spirits of all flesh, appoint a man over the congregation,
17
who may go out before them, and who may come in before them, and who may lead them out, and who may bring them in; that the congregation of Yahweh not be as sheep which have no shepherd."