If a person combines two prayers in the time of the first using tayammum, and then the time of the second enters and he finds water, does he repeat the prayer?

The questioner : And among the cases is when one combines two prayers in the time of the first, using tayammum, and then the time of the second enters, and he is obligated to pray because of sleep.

The Shaykh : Does he repeat it or not?

The questioner : Yes.

The Shaykh : He repeats it. The reason is that the act of worship occurred in its proper place, because it is permissible for him to combine in the manner commanded, so it does not harm if his condition changes afterward.