The Messenger of Allah ﷺ said, "I have not been commanded to build elaborate mosques."
قال رسول الله ﷺ: ما أمرت بتشييد المساجد.
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Abu Dawud (448) narrated it from Muhammad bin Sabbah bin Sufyan, who said, Sufyan bin Uyayna informed us, from Sufyan Thawri, from Abu Fizara, from Yazid bin Asam, from Ibn Abbas, and he mentioned it. Its chain is hasan, on account of Muhammad bin Sabbah, for he is hasan al-hadith. Ibn Hibban (1615) graded it sahih, narrating it by this same route. Bukhari (1/539), Abu Dawud, and Ibn Hibban also mentioned, as a statement of Ibn Abbas, "You will surely adorn it just as the Jews and Christians adorned theirs," as a mawquf and muallaq report. Some people have assumed that this is part of the marfu hadith, but it is not so. Rather, the Prophet's words are separate from the words of Ibn Abbas. Hafiz said, Bukhari only did not include the marfu portion of it because of disagreement over Yazid bin Asam regarding whether he connected it or left it disconnected. This is what he said, but he did not clarify this in a way that we could verify. Bayhaqi (2/438–439) narrated it through the route of Abu Dawud, and also through the route of Ali bin Qadim, who said, Sufyan Thawri narrated to us, likewise, and he did not mention this disagreement to which Hafiz alludes.What is meant by tashyid is raising a building and making it tall, and from this comes His saying, "in fortified towers" [Nisa 4:79], meaning towers whose construction has been made tall. This was noted by Baghawi in Sharh al-Sunnah (2/349).As for what Ibn Abbas narrated as marfu, "I see that you will tashriq your mosques after me just as the Jews tashriq their synagogues and the Christians tashriq their churches," this is very daif, indeed fabricated. Ibn Majah (740) narrated it from Jabarah bin Mughallas, who said, Abdul-Kareem bin Abdul-Rahman Bajali narrated to us, from Layth, from Ikrima, from Ibn Abbas, and he mentioned it. Jabarah bin Mughallas Hamani is very daif, and Daraqutni said, he is discarded, and some accused him of lying. Layth is Ibn Abu Salim, who is daif.His saying, "you will tashriq your mosques," comes from tashriq, which means plastering with shariq, which is the same as sarooj. It is said, a plastered basin, meaning coated with shariq, that is, sarooj, meaning the mortar mixture with which basins and other structures are plastered. Fairuzabadi said, mushriq referring to fortresses means plastered with shariq, that is, sarooj. End of quote. Both shariq and sarooj are Arabizations of the Persian word "jaru." See Al-Muarrab by Jawaliqi, edited by Dr. F. Abdul-Raheem, pages 416 and 421.An important note, the word "satushriqun" (you will plaster) has been corrupted into "satushrifun" (with a fa) in all manuscript copies of Ibn Majah, which makes no sense here.