Mishkat al-Masabih 4 Prayer كتاب الصلاة 144

وَعَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «اجْعَلُوا فِي بُيُوتِكُمْ مِنْ صَلَاتِكُمْ وَلَا تَتَّخِذُوهَا قُبُورًا»

Ibn ‘Umar reported God’s Messenger as saying, “Perform some of your prayer in your houses, and do not turn them into graves.”* * This is most probably a figurative expression indicating that a house in which prayer is not offered is like a grave, as God is not worshipped there. (Bukhari and Muslim.)