Hadithcore
Mishkat al-Masabih, 762

‘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 (<i>khimar</i>) covering the head and the breasts. Cf. Al-Quran; 24:31. Abu Dawud and Tirmidhi transmitted it.

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

References1 variant
In-Book Reference
Book 4, Hadith 190