Musnad Ahmad Hadith 18315

Najiyah ‘Anazi (may Allah have mercy on him) says that there was a difference of opinion between ‘Ammar (may Allah be pleased with him) and ‘Abdullah bin Mas‘ud (may Allah be pleased with him) regarding the issue of tayammum for a person in a state of janabah. ‘Abdullah bin Mas‘ud (may Allah be pleased with him) said: “If I do not find water for a month after becoming junub, even then I will not pray without performing ghusl.” ‘Ammar (may Allah be pleased with him) said: “Do you not remember that incident when once you and I were in a camel enclosure, and during the night I became junub, so I rolled in the dust like an animal, and when we returned to the service of the Prophet (ﷺ), I mentioned this to the Prophet (ﷺ), and the Prophet (ﷺ) said: ‘For you, tayammum would have been sufficient.’”