Arcana Coelestia#62
62. The stages and states of the regeneration of man - both of mankind and of the individual person - divide into six and are called the days of his creation. Gradually from being no man at all, he first becomes something, though only little, then something more, until the sixth day is reached, when he becomes 'an image'.
Genesis 9:12
12
And God said, This is the token of the covenant which I make between me and you and every living creature that is with you, for perpetual generations: