In answering Is there an Alternative to hajj, I stumbled upon this hadith quoted repeatedly:
O Messenger of Allah, the wealthy people will have higher grades and will have permanent enjoyment and they pray like us and fast as we do. They have more money, which they give in charity. ”The Prophet, sallallaahu `alayhi wa sallam (may Allaah exalt his mention), replied: “Has Allah not rendered for you the ‘Ishaa’ prayer in congregation equal to Hajj, and the Fajr prayer in congregation equal to ‘Umrah?”
It's attributed to "Muslim", presumably meaning Sahih Muslim, by these sites: IslamWeb, DailyHadith.co.uk, QuranReading.com, Understanding Islam (forum), hunafaatravel.com, MuslimPress.com, MasjidKingKhalid.org, among others.
However, the obvious web searches, e.g.
site:sunnah.com/muslim hajj congregation and
congregation hajj at sunnah.com, did not identify a reference to it in Sahih Muslim. (Although it comes up with Jami' at-Tirmidhi 586, which is listed as da'if.)
Question: Does Sahih Muslim contain a hadith to the effect of "has Allah not rendered for you the isha prayer in congregation equal to hajj"?
duniashuaib.com instead references it as "Sahih Al Jami 6432".