Genesis 6:3

Then the Lord said , My Spirit shall not abide in man forever , for he is flesh : his days shall be 120 years .

Then the Lord said, “My Spirit will not contend with humans forever, for they are mortal; their days will be a hundred and twenty years.”

And the Lord said, My spirit shall not always strive with man, for that he also is flesh : yet his days shall be an hundred and twenty years.