Bulugh al-Maram #287
The Book of Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَفِي
"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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About Bulugh al-Maram
This hadith is #287 from Bulugh al-Maram, in the Book of The Book of Prayer.