St Matthew 24:36-44

But of that day and hour no one knoweth, not the angels of heaven, but the Father alone. And as in the days of Noe, so shall also the coming of the Son of man be. For as in the days before the flood, they were eating and drinking, marrying and giving in marriage, even till that day in which Noe entered into the ark, And they knew not till the flood came, and took them all away; so also shall the coming of the Son of man be. Then two shall be in the field: one shall be taken, and one shall be left. Two women shall be grinding at the mill: one shall be taken, and one shall be left. Watch ye therefore, because ye know not what hour your Lord will come. But know this ye, that if the goodman of the house knew at what hour the thief would come, he would certainly watch, and would not suffer his house to be broken open. Wherefore be you also ready, because at what hour you know not the Son of man will come.