Many years passed by, people were wicked and have been committing a lot of sins. They disobeyed God's commandments and they weren't truthful to Him.
For all the iniquity that people did, God warned Noah that he will destroy mankind by sending a great flood into the Earth but, He will spare Noah and his family for they obeyed God and were truthful to Him.
God instructed Noah to build an ark which measured 450 (length) x 75 (width) x 45 (height), which is big enough for his family and for the animals.
Thank You My Lord
God commanded Noah to gather one pair of each kind of animal to get in the ark. God wanted to rescue the animals since they were not guilty of sin.
It rained for 40 days and 40 nights until the water level reached the highest peak of the mountains. The flood for 371 days, eliminating every mankind and the animals that were left outside.
After the flood, God rewarded Noah for obeying Him. God sent a rainbow as a sign of promise that He will never again do it.