Hadith 277
´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)."
Hadith 471
´Umm Salamah narrated:` "The Prophet would pray two Rak'ah after Al-Witr."