Author’s Note: I decided to combine these chapters because they are part of the same story, and otherwise Chapter 7’s post would have been very short.
Perhaps not coincidentally, Genesis 7 shows the first indications of the importance of the number seven. The “clean beasts” and “fowls” are brought into the ark “by sevens,” as instructed by God, and it was “after seven days” that the floodwaters came upon the earth (7:8-10).
The number seven, of course, is already significant because that’s how many days it took for God to create the earth plus one day of rest. This motif of a single number is a classic literary technique, and I’m sure it’s why seven has been and still is an important number in Western culture. (Harry Potter, anyone?)