Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
abudawud:319Sulaymān b. Dāwud al-Mahrī And ʿAbd al-Malik b. Shuʿayb > Ibn Wahb Naḥw Hadhā al-Ḥadīth

The Muslims stood up and struck the earth with their palms, but did not get any earth (in their hands). He (Ibn Wahb) then narrated the rest of the tradition in like manner, but he did not mention the words "shoulders" and "armpits". Ibn al-Laith said: (They) wiped above the elbows.  

أبو داود:٣١٩حَدَّثَنَا سُلَيْمَانُ بْنُ دَاوُدَ الْمَهْرِيُّ وَعَبْدُ الْمَلِكِ بْنُ شُعَيْبٍ عَنِ ابْنِ وَهْبٍ نَحْوَ هَذَا الْحَدِيثِ قَالَ

قَامَ الْمُسْلِمُونَ فَضَرَبُوا بِأَكُفِّهِمُ التُّرَابَ وَلَمْ يَقْبِضُوا مِنَ التُّرَابِ شَيْئًا فَذَكَرَ نَحْوَهُ وَلَمْ يَذْكُرِ الْمَنَاكِبَ وَالآبَاطَ قَالَ ابْنُ اللَّيْثِ إِلَى مَا فَوْقَ الْمِرْفَقَيْنِ