Shaqiq bin Salama reported,

I was sitting with Abdullah and Abu Musa, when Abu Musa asked, "Abu Abdur-Rahman, what do you say about a man who becomes ritually impure and cannot find water for a month? How should he perform the prayer?"Abdullah replied, "He should not perform tayammum, even if he does not find water for a month."Abu Musa said, "Then what about this verse in Surat al-Maidah, 'and you find no water, then perform tayammum with clean earth' [Maidah 5:6]?"Abdullah said, "If they were granted this concession in this verse, then as soon as the water felt cold to them, they would resort to performing tayammum with earth."Abu Musa said to Abdullah, "Have you not heard what Ammar said? 'The Messenger of Allah ﷺ sent me on an errand, and I became ritually impure but could not find water, so I rolled in the dust as an animal rolls. Then I came to the Prophet ﷺ and mentioned this to him, and he said, It would have been enough for you to do like this with your hands. He then struck the ground once with his hands, then wiped his left hand over his right and the backs of his palms and his face.'"Abdullah replied, "Do you not see that Umar himself was not satisfied with Ammar's account?"

عن شقيق بن سلمة قال

كنت جالسا مع عبد الله وأبي موسى، فقال أبو موسى: يا أبا عبد الرحمن! أرأيت لو أن رجلا أجنب فلم يجد الماء شهرا كيف يصنع بالصلاة؟ فقال عبد الله: لا يتيمم وإن أم يجد الماء شهرا، فقال أبو موسى: فكيف بهذه الآية في سورة المائدة: {فلم تجدوا ماء فتيمموا صعيدا طيبا} [المائدة ٦] فقال عبد الله: لو رخص لهم في هذه الآية لأوشك إذا برد عليهم الماء أن يتيمموا بالصعيد، فقال أبو موسى لعبد الله: ألم تسمع قول عمار: بعثني رسول الله ﷺ في حاجة فأجنبت، فلم أجد الماء، فتمرغت في الصعيد كما تمرغ الدابة، ثم أتيت النبي ﷺ فذكرت له ذلك، فقال: إنما كان يكفيك أن تقول بيديك هكذا، ثم ضرب بيديه الأرض ضربة واحدة، ثم مسح الشمال على اليمين وظاهر كفيه ووجهه؟ فقال عبد الله: أو لم تر عمر لم يقنع بقول عمار؟