It 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."
Reference: Sunan an-Nasa'i 1158 In-book : Book 12, Hadith 130 English translation : Vol. 2, Book 12, Hadith 1159
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