The world has become a wicked place, and the hearts of men have become evil. The people have angered Me. Yet you Noah have found favor in my eyes. So I am giving you this warning about what I am going to do so that you may be saved. I will flood the land and destroy all that they have made. They are a sinful people who are selfish, and care only for their own wants and pleasures. They make idols and worship them. They are violent and destructive. They pervert that which was pure. There is no love found in them. They have chosen a life that ends in death. You and your family however are chosen to live on. This is because you are faithful and obedient. For this reason I will save you and your family.
Now this is what I want you to do. I want you to build an ark. I will give you all the instruction you need to accomplish this task. The people will see what you are doing and ridicule and laugh at you. Yet you will not let this stop you, because you are not doing this to please them but to obey Me. You will finish the ark, and nothing they do will stop you. I the Lord, your God, favor you above all the men of the land. So do not listen to their words as they taunt you and judge you. Listen to Me alone and I will instruct you in all your ways.
Once you have built the ark you will then gather the animals and the birds as I have instructed you. Then place them within the ark. You will also gather food and supplies and place them within the ark. I ask you to do this because I am going to send a great flood. It will cleanse the land of the sins of the people, and they will no longer exist.
Gather your family with you and, close the door to the ark. You will be safe. The flood will come and destroy everything but you and your family. Inside you will have what you need. For forty days and nights it will rain upon the earth, and all the earth will be flooded.
The waters will subside after months have passed. As the waters lower you will send first a raven, next you will send out a dove to find dry land. Many days will pass when the dove shall return with a twig from an olive tree. You will then find the dry land and you will then be able come out of the ark with your family and all the animals. Then you will be fruitful and multiply. I have saved you and blessed you with a new life. If you do as I have instructed you all will be well. As a sign to you for this covenant I will now make, that I will never again destroy the earth with flood waters, I set my rainbow in the cloud that when you see it you will remember My promise.
Your Lord God Almighty
Genesis chapters 6, 7, & 8