15
εἶπεν δὲ ὁ θεὸς τῷ αβρααμ σαρα ἡ γυνή σου οὐ κληθήσεται τὸ ὄνομα αὐτῆς σαρα ἀλλὰ σαρρα ἔσται τὸ ὄνομα αὐτῆς
Genesis 17:15
Arcana Coelestia # 2067
2067. 'And I will bless him' means the multiplication of this, namely of the Rational meant by 'a son'. This is clear from the meaning of 'being blessed' as being enriched with everything good and true, dealt with just above in 2065.
