4216. 'And blessed them' means the resulting joy. This is clear from the meaning of 'blessing' as heartfelt desires for their happiness, dealt with in 3185, and so as giving evidence of joy when one is going away.
Arcana Coelestia # 1147
1147. 'And sons were born to them' means matters of doctrine deriving from those three. This is clear from the meaning of 'sons' in the internal sense as truths of faith, and also as falsities. Consequently matters of doctrine, both true and false, are meant, for such are the doctrines of Churches. That 'sons' has such a meaning, see above in 264, 489, 491, 533.