من لا يحضره الفقيه, volume 1, page 236

Hadith.707 - When Imam Ali ibn Abi Talib (as) saw the niches (mihrabs) in mosques, he would break them and say, "It is as if they are the altars of the Jews."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.

Hadith.708 - Imam Ali ibn Abi Talib (as) saw a mosque in Kufa that had been decorated or elevated and said: "It is as if it is a church. Mosques are not to be adorned; they should be built plain (simple)."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.

Hadith.709 - Abu Al-Hasan al-Awwal, Imam Musa ibn Jafar Al-Kadhim (as), was asked about using clay mixed with straw to plaster the mosque or the house where prayers are offered. Imam (as) said: "There is no harm in it."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.

Hadith.710 - He was asked about using plaster that had been prepared with dung for plastering a mosque. Imam (as) said: "There is no harm."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.

Hadith.711 - Abu Al-Hasan al-Awwal, Imam Musa ibn Jafar Al-Kadhim (as) was asked about a house that had been used as a latrine for a period of time and whether it would be suitable to make it into a mosque. Imam (as) said: "If it is cleaned and repaired, then there is no harm."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.

Hadith.712 - Ubaidullah ibn Ali Al-Halabi asked Imam Jafar ibn Muhammad Al-Sadiq (as) about a mosque within a house, where the owners might wish to expand part of it or move it from its original location. Imam (as) said: "There is no harm in that." Ubaydullah then asked: "Would it be suitable for a place that was previously used as a latrine for a period of time to be cleaned and made into a mosque?" Imam (as) said: "Yes, if soil is placed over it to cover it, as this cleanses and purifies it."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.