Genesis 8:3

3. And after the end of the hundred and fifty days. Some think that the whole time, from the beginning of the deluge to the abatement of the waters, is here noted; and thus they include the forty days in which Moses relates that there was continued rain. But I make this distinction, that until the fortieth day, the waters rose gradually by fresh additions; then that they remained nearly in the same state for one hundred and fifty days; for both computations make the period a little more than six months and a half. And Moses says, that about the end of the seventh month, the diminution of the waters appeared to be such that the ark settled upon the highest summit of a mountain, or touched some ground. And by this lengthened space of time, the Lord would show the more plainly, that the dreadful desolation of the world had not fallen upon it accidentally, but was a remarkable proof of his judgment; while the deliverance of Noah was a magnificent work of his grace, and worthy of everlasting remembrance. If, however, we number the seventh month from the beginning of the year, (as some do,) and not from the time that Noah entered the ark, the subsidence of which Moses speaks, took place earlier, namely, as soon as the ark had floated five months. If this second opinion is received, there will be the same reckoning of ten months; for the sense will be, that in the eighth month after the commencement of the deluge, the tops of the mountains appeared. Concerning the name Ararat, I follow the opinion most received. And I do not see why some should deny it to be Armenian the mountains of which are declared, by ancient authors, almost with one consents to be the highest. The Chaldean paraphrase also points out the particular part, which he calls mountains of Cardu, which others call Cardueni. But whether that be true, which Josephus has handed down respecting the fragments of the ark found there in his time; remnants of which, Jerome says, remained to his own age, I leave undecided.