Mishkat al-Masabih 4 Prayer كتاب الصلاة 190

وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا تُقْبَلُ صَلَاةُ حَائِضٍ إِلَّا بِخِمَارٍ» . رَوَاهُ أَبُو دَاوُد وَالتِّرْمِذِيّ

‘A’isha reported God’s Messenger as saying, “The prayer of a woman who has reached puberty is not accepted unless she is wearing a veil.”* * A veil ( khimar ) covering the head and the breasts. Cf. Al-Quran; 24:31. Abu Dawud and Tirmidhi transmitted it.