Allah (swt), the Exalted, said: "And if you are ill, or on a journey, or one of you comes from relieving himself, or you have touched women and you do not find water, then seek clean earth and wipe over your faces and hands with it. Allah (swt) does not intend to make difficulty for you, but He intends to purify you and complete His favour upon you so that you may be grateful." (Surah Al-Ma’idah 5:6).