Gen 6:17-21 God told Noah:
17 "I'm going to bring a flood on the Earth that will destroy everything alive under Heaven. Total destruction.
18 "But I'm going to establish a covenant with you: You'll board the ship, and your sons, your wife and your sons' wives will come on board with you. 19 You are also to take two of each living creature, a male and a female, on board the ship, to preserve their lives with you: 20 two of every species of bird, mammal, and reptile — two of everything so as to preserve their lives along with yours. 21 Also get all the food you'll need and store it up for you and them."