Genesis 8:5 YLT

³  And turn back do the waters from off the earth, going on and returning; and the waters are lacking at the end of a hundred and fifty days.

⁴  And the ark resteth, in the seventh month, in the seventeenth day of the month, on mountains of Ararat;

⁵  and the waters have been going and becoming lacking till the tenth month; in the tenth 'month', on the first of the month, appeared the heads of the mountains.

⁶  And it cometh to pass, at the end of forty days, that Noah openeth the window of the ark which he made,

⁷  and he sendeth forth the raven, and it goeth out, going out and turning back till the drying of the waters from off the earth.