Dead (Genesis 23:8) signifies night in respect to the goodness and truth of faith.

(References: Arcana Coelestia 2031)

2031. Verse 9 And God said to Abraham, And you shall keep My covenant, you and your seed after you throughout their generations.

'God said to Abraham' means perception. 'And you shall keep My covenant' means an even closer union. 'You and your seed after you' means that from Him there is a conjunction of all who have faith in Him. 'Throughout their generations' means the things that comprise faith.