Hadith
Bulugh al-Maram #318
The Book of Prayer· كتاب الصلاة
bulugh_al_maram:318وَفِي لَفْظٍ لِأَحْمَدَ : { فَأَقِمْ صُلْبَكَ حَتَّى تَرْجِعَ اَلْعِظَامُ } 11 - صحيح . وهذه الرواية عند أحمد (4/340) ، وابن حبان (1787) وزادا : "إلى مفاصلها " .
"Keep your back straight till the bones return (to their positions)."
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