Jami` at-Tirmidhi, Book 2, Hadith 129 (In-Book) ⓘ
Amir bin Sa'd [bin Abi Waqqas] narrated from his father: "The Prophet ordered placing the hands (on the ground) keeping the feet erect. (by resting feet on the toes and making the tips of the toes facing the Qiblah)."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ عَبْدِ الرَّحْمَنِ، أَخْبَرَنَا مُعَلَّى بْنُ أَسَدٍ، حَدَّثَنَا وُهَيْبٌ، عَنْ مُحَمَّدِ بْنِ عَجْلاَنَ، عَنْ مُحَمَّدِ بْنِ إِبْرَاهِيمَ، عَنْ عَامِرِ بْنِ سَعْدِ بْنِ أَبِي وَقَّاصٍ، عَنْ أَبِيهِ، أَنَّ النَّبِيَّ صلى الله عليه وسلم أَمَرَ بِوَضْعِ الْيَدَيْنِ وَنَصْبِ الْقَدَمَيْنِ .
also referenced under: Hadith 277 (Reference) & Volume 1, Book 2, Hadith 277 (DarusSalam)