Then it happened, on a certain day, that Joseph entered the house, and he was doing something, without any witnesses
Other versions
King James Version
And it came to pass about this time, that Joseph went into the house to do his business; and there was none of the men of the house there within.English Standard Version
But one day, when he went into the house to do his work and none of the men of the house was there in the house,New International Version
One day he went into the house to attend to his duties, and none of the household servants was inside.