Arcana Coelestia #670
670. That 'living creature' 1 means things of the understanding, and 'all flesh' those of the will, becomes clear from what has been stated already, and also from what follows. In the Word 'living creature' means all animal life in general, as in Genesis 1:10, 21, 24; 2:19. Here however, because the phrase 'all flesh' is added immediately after, it means things which belong to the understanding, for the reason given already, that the regeneration of the member of this Church had to begin in the things of the understanding. This also is why in the next verse 'birds' are mentioned first, which mean things of the understanding or the rational, and 'beasts', which are those of the will, second. 'Flesh' in particular means bodily-mindedness which is a feature of the will.
Footnotes:
1. literally, living soul
Arcana Coelestia #9390
9390. 'And he sent boys of the children of Israel' means those things that belong to innocence and charity. This is clear from the meaning of 'boys of the children of Israel' as things which belong to innocence and charity among members of the Church. For 'sucklings', 'young children', and 'boys' mean those who have innocence and charity, or in the abstract sense, without reference to persons, those things which belong to innocence and charity, 430, 5236; and 'the children of Israel' means members of the Church, or in the abstract sense, without reference to persons, the Church itself, 9340.