Bulugh al-Maram, Book 1, Hadith 140 (English)

In a version by Al-Bukhari, `Ammar said: 'He struck the earth with the palms of his hands, blew in them and wiped his face and hands with them.

وَفِي رِوَايَةٍ لِلْبُخَارِيِّ: وَضَرَبَ بِكَفَّيْهِ اَلْأَرْضَ, وَنَفَخَ فِيهِمَا, ثُمَّ مَسَحَ بِهِمَا وَجْهَهُ وَكَفَّيْه ِ (157)‏.‏ ‏2 ‏- البخاري رقم (338)‏.‏

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also referenced under: Book 1, Hadith 158 (In-Book)