I am (at times) affected by seminal emission but find no water. He ('Umar) told him not to say prayer. 'Ammar then said. Do you remember,0 Commander of the Faithful, when I and you were in a military detachment and we had had a seminal emission and did not find water (for taking bath) and you did not say prayer, but as for myself I rolled in dust and said prayer, and (when it was mentioned before) the Apostle ﷺ said: It was enough for you to strike the ground with your hands and then blow (the dust) and then wipe your face and palms. Umar said: 'Ammar, fear Allah. He said: If you so like, I would not narrate it. A hadith like this has been transmitted with the same chain of transmitters but for the words: 'Umar said: We hold you responsible for what you claim."
إِنِّي أَجْنَبْتُ فَلَمْ أَجِدْ مَاءً فَقَالَ لاَ تُصَلِّ فَقَالَ عَمَّارٌ أَمَا تَذْكُرُ يَا أَمِيرَ الْمُؤْمِنِينَ إِذْ أَنَا وَأَنْتَ فِي سَرِيَّةٍ فَأَجْنَبْنَا فَلَمْ نَجِدْ مَاءً فَأَمَّا أَنْتَ فَلَمْ تُصَلِّ وَأَمَّا أَنَا فَتَمَعَّكْتُ فِي التُّرَابِ وَصَلَّيْتُ فَقَالَ النَّبِيُّ ﷺ إِنَّمَا كَانَ يَكْفِيكَ أَنْ تَضْرِبَ بِيَدَيْكَ الأَرْضَ ثُمَّ تَنْفُخَ ثُمَّ تَمْسَحَ بِهِمَا وَجْهَكَ وَكَفَّيْكَ فَقَالَ عُمَرُ اتَّقِ اللَّهَ يَا عَمَّارُ قَالَ إِنْ شِئْتَ لَمْ أُحَدِّثْ بِهِ قَالَ الْحَكَمُ وَحَدَّثَنِيهِ ابْنُ عَبْدِ الرَّحْمَنِ بْنِ أَبْزَى عَنْ أَبِيهِ مِثْلَ حَدِيثِ ذَرٍّ قَالَ وَحَدَّثَنِي سَلَمَةُ عَنْ ذَرٍّ فِي هَذَا الإِسْنَادِ الَّذِي ذَكَرَ الْحَكَمُ فَقَالَ عُمَرُ نُوَلِّيكَ مَا تَوَلَّيْتَ