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.
tirmidhi:270Muḥammad b. Bashhār Bundār > Abū ʿĀmir al-ʿAqadī > Fulayḥ b. Sulaymān > ʿAbbās b. Sahl > Abū Ḥumayd al-Sāʿidī

"When the Prophet would prostrate, he placed his nose and his forehead on the ground, and he held his forearms away from his sides, and he placed his hands parallel to his shoulders."  

الترمذي:٢٧٠حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ بُنْدَارٌ حَدَّثَنَا أَبُو عَامِرٍ الْعَقَدِيُّ حَدَّثَنَا فُلَيْحُ بْنُ سُلَيْمَانَ حَدَّثَنِي عَبَّاسُ بْنُ سَهْلٍ عَنْ أَبِي حُمَيْدٍ السَّاعِدِيِّ

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا سَجَدَ أَمْكَنَ أَنْفَهُ وَجَبْهَتَهُ مِنَ الأَرْضِ وَنَحَّى يَدَيْهِ عَنْ جَنْبَيْهِ وَوَضَعَ كَفَّيْهِ حَذْوَ مَنْكِبَيْهِ قَالَ وَفِي الْبَابِ عَنِ ابْنِ عَبَّاسٍ وَوَائِلِ بْنِ حُجْرٍ وَأَبِي سَعِيدٍ  

قَالَ أَبُو عِيسَى حَدِيثُ أَبِي حُمَيْدٍ حَدِيثٌ حَسَنٌ صَحِيحٌ وَالْعَمَلُ عَلَيْهِ عِنْدَ أَهْلِ الْعِلْمِ أَنْ يَسْجُدَ الرَّجُلُ عَلَى جَبْهَتِهِ وَأَنْفِهِ فَإِنْ سَجَدَ عَلَى جَبْهَتِهِ دُونَ أَنْفِهِ فَقَدْ قَالَ قَوْمٌ مِنْ أَهْلِ الْعِلْمِ يُجْزِئُهُ وَقَالَ غَيْرُهُمْ لاَ يُجْزِئُهُ حَتَّى يَسْجُدَ عَلَى الْجَبْهَةِ وَالأَنْفِ