بُلُوغُ الْمَرَامِ
Bulugh al-Maram 207
The Book of Prayer
وَعَنْهَا , عَنْ اَلنَّبِيِّ - صلى الله عليه وسلم -قَالَ : { لَا يَقْبَلُ اَللَّهُ صَلَاةَ حَائِضٍ إِلَّا بِخِمَارٍ } رَوَاهُ اَلْخَمْسَةُ إِلَّا النَّسَائِيُّ , وَصَحَّحَهُ اِبْنُ خُزَيْمَةَ. [1]
Narrated ['Aishah (RA)]: The Prophet (ﷺ) said: "The Salat (prayer) of a woman, who has reached puberty, is not accepted unless she is wearing a Khimar." [Reported by al-Khamsah except an-Naza'i. And Ibn Khuzaimah graded it Sahih (authentic)].
Sunnah.com reference: Book 2, Hadith 70