Genesis 7:6, 11-12, 24

Now Noah was six hundred years old when the flood of water came upon the earth.

In the six hundredth year of Noah’s life, in the second month, on the seventeenth day of the month, on the same day all the fountains of the great deep burst open, and the floodgates of the sky were opened. The rain fell upon the earth for forty days and forty nights.

The water prevailed upon the earth one hundred and fifty days.