Jami' at-Tirmidhi
Jami` at-Tirmidhi 277
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 .
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Abd Allah ibn Abd al-Rahman narrated to us: Mualla ibn Asad informed us: Wuhayb narrated to us, from Muhammad ibn Ajlan, from Muhammad ibn Ibrahim, from Amir ibn Sa‘d ibn Abi Waqqas, from his father, that the Prophet instructed that the hands be placed on the ground and the feet held upright.
Notes and open questions — unreviewed
The Arabic says to place the hands and set the feet upright; the direction of the toes is not specified in this brief wording.