I was with Umar when a man came to him and said, "We sometimes stay in a place for a month or two without finding water."Umar replied, "As for me, I would not pray until I found water."Ammar said, "Commander of the Believers, do you not remember when you and I were tending camels and we became junub? As for me, I rolled in the dust. Then we came to the Prophet ﷺ and I mentioned it to him, and he said, 'It would have been enough for you to do this.' He struck the ground with his hands, blew on them, then wiped his face and his hands up to the middle of his forearms."Umar said, "Ammar, fear Allah."Ammar replied, "Commander of the Believers, if you wish, by Allah, I will never mention it again."Umar said, "No, by Allah, we will leave that matter to you to handle as you see fit."
حدثنا محمد بن كثير العبدي حدثنا سفيان عن سلمة بن كهيل عن أبي مالك
كنت عند عمر فجاءه رجل فقال إنا نكون بالمكان الشهر والشهرين فقال عمر أما أنا فلم أكن أصلي حتى أجد الماء قال فقال عمار يا أمير المؤمنين أما تذكر إذ كنت أنا وأنت في الإبل فأصابتنا جنابة فأما أنا فتمعكت فأتينا النبي ﷺ فذكرت ذلك له فقال إنما كان يكفيك أن تقول هكذا وضرب بيديه إلى الأرض ثم نفخهما ثم مسح بهما وجهه ويديه إلى نصف الذراع فقال عمر يا عمار اتق الله فقال يا أمير المؤمنين إن شئت والله لم أذكره أبدا فقال عمر كلا والله لنولينك من ذلك ما توليت
[Sahih] Bayhaqi reported it, 1/210, from the hadith of Abu Dawud through this same chain, and see the two following hadiths.