Albert Barnes Commentary Matthew 24:38

"For as in those days which were before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noah entered into the ark," — Matthew 24:38 (ASV)

For as in the days, etc. The things mentioned here denote attention to the affairs of this life, rather than to what was coming on them. It does not mean that these things were wrong, but only that such was their actual employment, and that they were regardless of what was coming upon them.