Sunan an-Nasa'i 1158
سنن النسائي#1158SahihIt was narrated from Al-Qasim who narrated from 'Abdullah-he is Ibn Abdullah bin 'Umar- that:His father (Ibn 'Umar) said: "One of the sunnahs of the prayer is to hold the right foot upright and point its toes toward the Qiblah, and to sit on the left foot
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 12:130