Matthew 24:39-41, 44

and they knew nothing about what would happen until the flood came and took them all away. That is how it will be at the coming of the Son of Man. Two men will be in the field; one will be taken and the other left. Two women will be grinding with a hand mill; one will be taken and the other left.

So you also must be ready, because the Son of Man will come at an hour when you do not expect him.