(2) باب تَشْيِيدِ الْمَسَاجِدِ
It was narrated that 'Umar bin Khattab said:
The Messenger of Allah said: "No people's deeds ever became evil deeds but they started to adorn their places of worship."
Reference: Sunan Ibn Majah 741
In-book reference: Book 4, Hadith 7
English translation: Vol. 1, Book 4, Hadith 741