If wetness disappears in the palm of the hand...

If wetness disappears in the palm of the hand, it cannot be made wet with some other water. However, the person performing ablutions should obtain wetness from his beard. In case, however, wetness is obtained from any spot other than the beard it would be difficult to say that wiping has been performed properly. 264.

If the wetness of palm is such that only the wiping of head can be performed one should wipe the head first and for the wiping of insteps the wetness should be obtained from the beard. 265. Wiping performed on socks or shoes is void. Hence, if it is very cold or socks or shoes cannot be taken off on account of the fear of an enemy or a beast etc., one should perform tayammum. (See, Article No. 708).

And in case a person is under Taqayyah (hiding one's faith) he should perform wiping on his socks and shoes and should also perform Tayammum. 266. If the instep is impure and it cannot also be washed for wiping one should perform Tayammum.…