Tayammum for the one in a state of major ritual impurity who fears the cold

Question:
Honorable Shaykh, may Allah grant you success. This questioner says: Is it true that if a person is in a state of major ritual impurity and cannot perform the full ritual bath out of fear of the cold, is it true that he may perform dry ablution with clean earth so that he can catch up with the prayer?

Answer:
If he fears harm to himself, and he has no means to heat the water, and he is in the desert with no means to heat the water, then he performs dry ablution with clean earth, just as 'Amr ibn al-'As (may Allah be pleased with him) did, and the Messenger (peace and blessings be upon him) approved of it. If he fears harm to himself from the cold, and he has nothing to heat the water with, and he is in the desert, then he performs dry ablution with clean earth and prays. But if he is in a town where there are means of heating, then it is not permissible for him to perform dry ablution with clean earth; it is not permissible, because he has means of heating.