Hadith
Bulugh al-Maram #287
The Book of Prayer· كتاب الصلاة
bulugh_al_maram:287وَفِي "اَلصَّحِيحِ" عَنْ مُعَيْقِيبٍ نَحْوُهُ بِغَيْرِ تَعْلِيلٍ. 11 - صحيح . رواه البخاري (1207) ، ومسلم (546) ولفظه : " إن كنت فاعلا فواحدة".
It is also reported in as-Sahih on the authority of Mu'aiqib without mention of the reason.
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