Bulugh al-Maram #342
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.
وَعَلَى هَذَا يُحْمَلُ اَلنَّفْيُ فِي رِوَايَةِ مُسْلِمٍ , خِلَافًا لِمَنْ أَعَلَّهَا. 1 .1 - قلت : نعم . ولكن بعد ثبوت رواية ابن خزيمة ، وقد تبين أنها لا تثبت ، وأما عن إعلال رواية مسلم، فقد أجاب الحافظ نفسه في "الفتح" أحسن جواب.
The negation (of recitation of the Bismillah) in the report of Muslim can be understood in light of this report (i.e. it was recited silently), as opposed to those who declared Muslim's report as being defective.
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About Bulugh al-Maram
This hadith is #342 from Bulugh al-Maram, in the Book of The Book of Prayer.