Arcana Coelestia #883
883. 'The dove returned to him at evening time' means that these started to show themselves a little; and 'evening time' is similar to pre-morning twilight. This in like manner becomes clear from that has been stated already at verse 8, and also from the fact that here it is called 'evening time'. Concerning 'evening', see what has been stated in Genesis 1, where six times the statement is made 'there was evening and there was morning'. 'Evening' is a word that has to do with regeneration and indeed with that state when a person is still in near-darkness, or when there is still only a tiny quantity of light showing itself to him. Morning itself is described in verse 13 below by 'he removed the roof from the ark and saw out'. Because 'evening' meant the pre-morning twilight, mention of the evening is made so many times in the Jewish Church. This also is why sabbaths and festivals began from evening onwards, and why Aaron was commanded to light the sacred lamp 'in the evening', Exodus 27:21.
Genesis 1:7-9
7
God made the expanse, and divided the waters which were under the expanse from the waters which were above the expanse; and it was so.
8
God called the expanse "sky." There was evening and there was morning, a second day.
9
God said, "Let the waters under the sky be gathered together to one place, and let the dry land appear;" and it was so.