That the Messenger of Allah ﷺ said: "Indeed there are others inhabiting your homes. So yell at them three times (to leave). If you see any of them after that, then kill them."
قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ لِبُيُوتِكُمْ عُمَّارًا فَحَرِّجُوا عَلَيْهِنَّ ثَلاَثًا فَإِنْ بَدَا لَكُمْ بَعْدَ ذَلِكَ مِنْهُنَّ شَيْءٌ فَاقْتُلُوهُ