“At Jumu’ah prayer the Imaam giving the sermon mentioned amongst other things the hadith, “The believer to the believer is like a [solid] building, some [parts of it] support others …” [Bukhaari and Muslim] adding the word, ‘… solid …’ [which is not part of the narration]. So after the jumu’ah prayer ended Shaikh al-Albaani stood up and turned to the people and made clear the absence of the word ‘solid’ in the narration of the hadith and urged that the hadiths be narrated as they came without any additions.
So, by Allaah, his critique was better than the sermon itself.”
Muhaddithul-Asr, Muhammad Naasirud-Deen al-Albaani of Samir ibn Amin al-Zahraani, pp. 31-32.