Tayammum is a concession that Allah (may He be exalted) has prescribed for His slaves when water is not available or it is not possible to use it, so as to make things easy for them, as it removes impurity (hadath) and makes it permissible to offer the prayer and do other acts of worship. ‘Abdullah ibn Mas‘ud (may Allah be pleased with him) narrated that in the beginning, tayammum was an alternative to wudu’ only, not to ghusl. In this hadith, the Tabi‘i Shaqiq ibn Salamah reports the discussion that took place between ‘Abdullah ibn Mas‘ud and Abu Musa al-Ash‘ari (may Allah be pleased with them both) about this matter, as Abu Musa (may Allah be pleased with him) said to ‘Abdullah ibn Mas‘ud (may Allah be pleased with him): What if a man becomes junub and cannot find water for a month; would he not do tayammum and pray? Abu Musa objected to the view of Ibn Mas‘ud (may Allah be pleased with him) which said that tayammum cannot be done in the case of janabah, and a person in this situation cannot pray until he finds water. Then he [Abu Musa] quoted as evidence [to refute the view of Ibn Mas‘ud] the verse in which Allah (may He be exalted) says: {[But if you] do not find water, then seek clean earth…} [al-Ma’idah 5:6] ‘Abdullah ibn Mas‘ud (may Allah be pleased with him) responded to him by saying that if people were granted a concession allowing them to do tayammum in this case, then people would most likely, every time they found the water to be cold, seek clean earth [to do tayammum] and they would stop washing with water. Ibn Mas‘ud (may Allah be pleased with him) suggested that if we go along with the view that it is permissible for the one who is junub to do tayammum, that might open the door to being too heedless with regard to tayammum, so everyone who found the water cold would do tayammum [instead of ghusl]. Thus he wanted to prevent people from resorting to it for trivial reasons, by preventing them from doing tayammum to cleanse themselves from janabah instead of doing ghusl. But Abu Musa (may Allah be pleased with him) quoted the hadith of ‘Ammar ibn Yasir (may Allah be pleased with him), in which he said that the Messenger of Allah (blessings and peace of Allah be upon him) sent him on an errand, and that during this journey he became junub, so he rolled in the dust like an animal. According to a report narrated in Sahih al-Bukhari, ‘Umar ibn al-Khattab was with ‘Ammar (may Allah be pleased with them both), and he also became junub, but he refrained from doing tayammum and decided not to pray until he was able to find water. Then when ‘Ammar returned, he told the Prophet (blessings and peace of Allah be upon him) about that, and that he had rolled in the dust with the intention of doing tayammum to cleanse himself of janabah. So the Prophet (blessings and peace of Allah be upon him) taught him how to do tayammum, which is to pat the dust with both hands, then blow on them to reduce the dust, then wipe the hands and face with them. This proves that it is valid for one who is junub to do tayammum. Thus ‘Abdullah ibn Mas‘ud disagreed with Abu Musa (may Allah be pleased with them both), and said to him: Did you not see that ‘Umar was not convinced of what ‘Ammar said? Here he was referring to when ‘Umar ibn al-Khattab (may Allah be pleased with him) did not remember that the Prophet (blessings and peace of Allah be upon him) said this to ‘Ammar (may Allah be pleased with him) when ‘Ammar (may Allah be pleased with him) told him about this incident. It was as if ‘Abdullah (may Allah be pleased with him) was using ‘Umar’s view as evidence to prove that tayammum was not valid in the case of janabah and major impurity. This hadith highlights the fact that the Sahabah used to discuss issues of knowledge and quote as evidence the Book of Allah, the Sunnah of His Prophet (blessings and peace of Allah be upon him) and sound analogies to both. .