Genesis 7:1 "And the LORD said unto Noah, Come thou and all thy house into the ark; for thee have I seen righteous before me in this generation."
Verses 7:2-3: “Sevens … sevens”: The extra 6 pairs of clean animals and birds would be used for sacrifice (8:20), and food (9:3).
Genesis 7:2 "Of every clean beast thou shalt take to thee by sevens, the male and his female: and of beasts that [are] not clean by two, the male and his female."
“Clean … not clean”: The distinction relates to sacrifice (in 8:20). Later, it has to do with eating (in Leviticus 11 and Deuteronomy 14).
“By sevens … by two”: Literally, “seven sevens” of every clean beast, which may mean seven pairs or three pairs, plus one, with the extra one being used for sacrifice later on.
Genesis 7:3 "Of fowls also of the air by sevens, the male and the female; to keep seed alive upon the face of all the earth."
“Of fowls also of the air by sevens, the male and his female”. That is, of such as were clean; seven couple of these were to be brought into the ark, for the like use as of the clean beasts, and those under the law; and so at this time, and here meant were turtledoves, and young pigeons that were for sacrifice; and the rest were for food.
Genesis 7:4 "For yet seven days, and I will cause it to rain upon the earth forty days and forty nights; and every living substance that I have made will I destroy from off the face of the earth."
God allowed one more week for sinners to repent. Think about it. Noah and his family – and animals coming from every direction, were going inside the Ark. It took a week to get them all inside. The people in the area had to have seen what was happening.
But even then, they did not believe.
In verse 5, we see the unquestioning obedience of Noah when God spoke.
Genesis 7:5 "And Noah did according unto all that the LORD commanded him."
He prepared for his entrance into the ark, and all the creatures with him; got everything ready for them, the rooms for their habitation, and food for their sustenance.
Genesis 7:6 "And Noah [was] six hundred years old when the flood of waters was upon the earth."
When it began; he was in his six hundred and first year when it ended (Gen. 8:13).
Genesis 7:7 "And Noah went in, and his sons, and his wife, and his sons' wives with him, into the ark, because of the waters of the flood."
Genesis 7:8 "Of clean beasts, and of beasts that [are] not clean, and of fowls, and of every thing that creepeth upon the earth,"
In obedience to a Divine impulse. Nothing short of Divine power could have effected such a timely and orderly entrance of the creatures into the huge vessel.
Genesis 7:9 "There went in two and two unto Noah into the ark, the male and the female, as God had commanded Noah."