There is no basis for adding the word
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The Shaykh: Sunan an-Nasa'i 2560Sahih (Darussalam) And I say on this occasion that the hadith has become famous on the tongues of some preachers and exhorters with the addition of "al-murassas" (well-joined). The word "al-murassas" has no basis in the hadith; the hadith is without it: Sunan an-Nasa'i 2560Sahih (Darussalam) , and buildings are usually not well-joined, so this statement is idle talk. First, it is not permissible to add to the hadith that is established from the Messenger (peace and blessings be upon him) without this word anything that the Messenger (peace and blessings be upon him) did not utter. And on this occasion as well, I say, even if I have spoken at length to you.
The believers are like a building they support one another.
والمؤمن للمؤمن كالبنيان يشدُّ بعضُه بعضًاThe believer to the believer is like a solid building.
المؤمن للمؤمن كالبنيان المرصوصThe believers are like a building they support one another.
المؤمن للمؤمن كالبنيان يشدُّ بعضه بعضًا
Source
www.al-albany.com
The Arabic text is copied verbatim from the original source, without any edits.