Beware of getting, into the houses and meeting women (in seclusion). A person from the Ansar said: Messenger of Allah, what about husband's brother, whereupon he ﷺ said: Husband's brother is like death. (Using translation from Muslim 2172a)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ إِيَّاكُمْ وَالدُّخُولَ عَلَى النِّسَاءِ فَقَالَ رَجُلٌ مِنَ الْأَنْصَارِ يَا رَسُولَ اللهِ أَفَرَأَيْتَ الْحَمْوَ؟ قَالَ الْحَمْوُ الْمَوْتُ