وَعَن عمار قَالَ: جَاءَ رَجُلٌ إِلَى عُمَرَ بْنِ الْخَطَّابِ فَقَالَ: إِنِّي أَجْنَبْتُ فَلَمْ أُصِبِ الْمَاءَ فَقَالَ عمار بن يَاسر لعمر بن الْخطاب أَمَا تَذْكُرُ أَنَّا كُنَّا فِي سَفَرٍ أَنَا وَأَنْتَ فَأَمَّا أَنْتَ فَلَمْ تُصَلِّ وَأَمَّا أَنَا فتمعكت فَصليت فَذكرت للنَّبِي صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسلم إِنَّمَا كَانَ يَكْفِيكَ هَكَذَا فَضَرَبَ النَّبِيُّ صَلَّى الله عَلَيْهِ وَسلم بكفيه الأَرْض وَنفخ فيهمَا ثمَّ مسح بهما وَجْهَهُ وَكَفَّيْهِ. رَوَاهُ الْبُخَارِيُّ وَلِمُسْلِمٍ نَحْوُهُ وَفِيهِ قَالَ: إِنَّمَا يَكْفِيكَ أَنْ تَضْرِبَ بِيَدَيْكَ الْأَرْضَ ثمَّ تنفخ ثمَّ تمسح بهما وَجهك وكفيك

Do you not remember that you and I were on a journey and you did not pray, but I rolled myself on the ground, then prayed? I mentioned that afterwards to the Prophet, and he said,“It would have been enough for you to do thus”—and the Prophet struck the ground with the palms of his hands, blew into them, then wiped his face and the palms of his hands with them. Bukhari transmitted it, and Muslim has something similar, in which he said, “It is enough for you to strike the ground with your hands, then blow, then wipe your face and the palms of your hands with them.”