I heard Ibn Zubayr say, "Aligning the feet and placing one hand upon the other are from the Sunnah."
حدثنا نصر بن علي أخبرنا أبو أحمد عن العلاء بن صالح
سمعت ابن الزبير يقول صف القدمين ووضع اليد على اليد من السنة
No references are available.
[Its isnad is hasan]It was narrated by Bayhaqi (2/30) from the hadith of Abu Dawud through this chain, and Diya included it in Al-Mukhtarah (9/301, no. 257). Zurah here has been narrated from by two reliable narrators, and Ibn Hibban, Dhahabi, and Diya Maqdisi have all confirmed his reliability, so his hadith does not fall below the level of hasan.