أَتَأْذَنُ لِي أَنْ أَكُونَ مَعَكُما تَحْتَ الْكِساءِ مَا ذُكِرَ خَبَرُنا هذَا فِي مَحْفِلٍ مِنْ مَحَافِلِ أَهْلِ الاْرْضِ Within the verse of purity the phrase Bayt is singular, and isn't wives of Ahle Bayt but Ahle Buyoot, indicating of different residences, and Alif and Laam has become enjoined to Bayt, from https://networkbookmarks.com/story13285644/5-essential-elements-for-imam-hussain