Sahih Muslim 368 c
Abd al-Rabmin b. Abza narrated It on the authority of his father that a man came to 'Umar and said:
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."
حَدَّثَنِي عَبْدُ اللَّهِ بْنُ هَاشِمٍ الْعَبْدِيُّ، حَدَّثَنَا يَحْيَى، - يَعْنِي ابْنَ سَعِيدٍ الْقَطَّانَ - عَنْ شُعْبَةَ، قَالَ حَدَّثَنِي الْحَكَمُ، عَنْ ذَرٍّ، عَنْ سَعِيدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ أَبْزَى، عَنْ أَبِيهِ، أَنَّ رَجُلاً، أَتَى عُمَرَ فَقَالَ 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 صلى الله عليه وسلم ‏
"‏ 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 ‏.‏