Sahih Muslim , Book 4, Hadith 1704 (USC-MSA) ⓘ
Ibn 'Umar reported Allah's Apostle as saying: Pray in your houses, and do not make them graves.
وَحَدَّثَنَا ابْنُ الْمُثَنَّى، حَدَّثَنَا عَبْدُ الْوَهَّابِ، أَخْبَرَنَا أَيُّوبُ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " صَلُّوا فِي بُيُوتِكُمْ وَلاَ تَتَّخِذُوهَا قُبُورًا " .
also referenced under: Book 6, Hadith 249 (In-Book) & Hadith 777 (Reference)