Ibn 'Abd al-Rahman b. Abza reported on the authority of his father this incident from 'Ammar. He said:
This would have been enough for you, and the Prophet ﷺ struck the ground with his hand. He then blew it and wiped with it his face and hands. Being doubtful Salamah said: I do not know (whether he wiped) up to the elbows or the wrists.

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا مُحَمَّدٌ، - يَعْنِي ابْنَ جَعْفَرٍ - أَخْبَرَنَا شُعْبَةُ، عَنْ سَلَمَةَ، عَنْ ذَرٍّ، عَنِ ابْنِ عَبْدِ الرَّحْمَنِ بْنِ أَبْزَى، عَنْ أَبِيهِ، عَنْ عَمَّارٍ، بِهَذِهِ الْقِصَّةِ فَقَالَ " إِنَّمَا كَانَ يَكْفِيكَ " . وَضَرَبَ النَّبِيُّ ﷺ بِيَدِهِ إِلَى الأَرْضِ ثُمَّ نَفَخَ فِيهَا وَمَسَحَ بِهَا وَجْهَهُ وَكَفَّيْهِ شَكَّ سَلَمَةُ وَقَالَ لاَ أَدْرِي فِيهِ إِلَى الْمِرْفَقَيْنِ . يَعْنِي أَوْ إِلَى الْكَفَّيْنِ .