Gen. 2:6
There went up a mist
After considering several commentaries, there are two main possibilities here.
1. This mist could have simply fallen as rain later. Notice that this is just the way clouds form; there is dew, that dew evaporates into the atmosphere, and so on. This could be God’s way of explaining how rain occurs. In other words, what is meant here is that it had not rained on the earth, but a mist went up from the ground, so it soon would. Or,
2. It could haven a supernatural mist, which changed when man brought sin into the world. God’s ways are incredible, after all.
I believe God could have used just this dew and mist to water the plants. However, option #1 is equally valid. The Bible doesn’t state clearly that there was no rain till the Flood of Noah. This is another area where we see through a glass darkly.
The important part, however, is coming. It shows God made man special. It shows consistency with chapter 1, also. We will see more specifically how He made all those creatures on the sixth day of Creation.