Abdul-Rahman bin Abza reported,

Hakam heard it from Ibn Abdul-Rahman, who said that a man became ritually impure and came to Umar and said, "I have become impure and could not find water."Umar said, "Then do not pray."Ammar said to him, "Don't you remember when we were on a military expedition together and both became impure? You did not pray, but I rolled in the dust and prayed. Then I came to the Prophet ﷺ and mentioned that to him, and he said, 'It would have been enough for you to do this.'" Then Shuba struck the ground once with his palm, blew into it, rubbed his hands together, and wiped his face with them.Umar said something, I do not know what.Ammar said, "If you wish, I will not narrate it."He mentioned something in this chain of narration from Abu Malik, and Salama added, He said, "Rather, we leave to you the responsibility of what you have taken upon yourself."

أخبرنا إسمعيل بن مسعود أنبأنا خالد أنبأنا شعبة عن الحكم سمعت ذرا يحدث

عن ابن أبزى عن أبيه قال

وقد سمعه الحكم من ابن عبد الرحمن قال أجنب رجل فأتى عمر رضي الله عنه فقال إني أجنبت فلم أجد ماء قال لا تصل قال له عمار أما تذكر أنا كنا في سرية فأجنبنا فأما أنت فلم تصل وأما أنا فإني تمعكت فصليت ثم أتيت النبي ﷺ فذكرت ذلك له فقال إنما كان يكفيك وضرب شعبة بكفه ضربة ونفخ فيها ثم دلك إحداهما بالأخرى ثم مسح بهما وجهه فقال عمر شيئا لا أدري ما هو فقال إن شئت لا حدثته وذكر شيئا في هذا الإسناد عن أبي مالك وزاد سلمة قال بل نوليك من ذلك ما توليت