"The Messenger of Allah ﷺ would put his mouth on the place from which I had drunk, and he would drink from my leftovers when I was menstruating." (Using translation from Nasāʾī 378)
كَانَ رَسُولُ اللهِ ﷺ «يَضَعُ فَاهُ عَلَى الْمَوْضِعِ الَّذِي أَشْرَبُ مِنْهُ وَيُشْرَبُ مِنْ فَضْلِ شَرَابِي وَأَنَا حَائِضٌ»