Genesis 7

1 Even after all the years it took to build the ark, Noah was the only person who was righteous in God's eyes. It appears that Noah spoke to others about righteousness, but not a single person repented (2 Pet 2:5).

Noah's family was spared, but we are not specifically told whether they were spared because of their trust in God, or simply because they belonged to Noah's family. Perhaps we could argue that if they did not believe then they would have left Noah during the construction of the ark.

2 This is the first time we hear of "clean" animals. It is not defined here, and we can only assume that the definition of "clean" was the same for Noah as it would later be for Moses (Lev 11:1-47). Before the end of the Flood, people were not to eat meat. After the flood it does not appear that God specifies which animals may or may not be eaten (Gen 9:3).

Cleanness appears to be important in sacrificial matters. After the flood, Noah offered a sacrifice of every clean animal (Gen 8:20). However, the term "clean" is not defined, and we do not know if cleanness was defined before this time.

Whether the term "clean" was defined ahead of time or not, Noah would certainly know that an animal was clean when seven of them showed up at the ark. There would be no mistake because God would designate what a clean animal was. Noah did not have to decide.

More clean than unclean animals were taken. Obviously, more would be needed for the post-Flood sacrifice. Another reason could have been that God wanted to preserve more variety in the "clean" gene pool. Later, the health of a sacrificial animal would become important as its species in determining whether it was fit to sacrifice. A gene pool with more variety would ensure a larger portion of healthy animals.

Notice that the language seems indicates that two pairs of each kind of clean animal was taken ("male and his female"), and likewise, seven pairs of each kind of unclean animal. Thus, while the popular image is of two of each kind of animal, it was really either four or fourteen of each kind of animal.

3 God does not indicate that all birds are clean here, He simply indicates that seven of each type is necessary to make sure that they survive after the Flood (Gen 8:20).
4 God gave Noah one week to get the ark loaded and ready to float (the ark was designed to float, not sail to a particular destination). God told Noah how long it was to rain.

Remember that it may not have yet rained, so this would be something that Noah did not fully understand (Gen 2:5).

5 Noah's faith was displayed in his obedience.
6 Some take Gen 6:3 to indicate that there were 120 years between God's pronouncement and the coming of the Flood. However, this pronouncement comes sequentially after we are told that Noah is over 500 years old and had three sons (Gen 5:32). Again, in Gen 6:9-14 it appears that Noah already had three sons when God told him to build the ark. Thus, it follows that the ark took less than 100 years to build, and that the 120 years that is spoken of in Gen 6:3 refers to the maximum life expectancy that people would experience at some point after the flood.
9 The animals entered the ark in male-female pairs.
10 Just as God had promised.
11 This is an historical account, it is not a myth or allegory. The author wants the reader to know that this is an actual event with a definite place in time.

There were apparently large pools of water beneath the earth's surface. This subterranean water likely existed under the oceans and under the continent. These probably fed the springs that watered the continent (Gen 2:6). The breaking of the foundations of the deep is the most likely event that would have split the continent into several pieces. These pieces probably spread apart during the course of the Flood. We can still see where some of our present continents may have fit together before the flood.

Rain began to pour from the sky. The source could have been a bubble of water vapor that may have surrounded the planet at one time (Gen 1:6-8). Another source could possibly have been from outer space. It is also possible that God created the water.

The world was deluged from above and below.

16 Noah apparently could not close the door once he was inside the ark. God did this for him.
19 These two verses dismiss any doubt that the Bible indicates that the flood was a worldwide cataclysmic event.
20 Some have questioned how the tops of the mountains could be covered, since there does not appear to be enough water on earth to do this today. The mountains that exist today are much taller than they were before the Flood. All our tall mountains were formed by the surface of the earth buckling as the continents shifted and collided during and after the Flood.
22 Everything that was not on the ark and breathed died.
24 After the rain, the floodwaters remained. No animal would be able to swim and survive for 150 days.