بُلُوغُ الْمَرَامِ
Bulugh al-Maram 142
The Book of Purification
Menstruation
وَفِي رِوَايَةٍ لِلْبُخَارِيِّ: { وَتَوَضَّئِي لِكُلِّ صَلَاةٍ } وَهِيَ لِأَبِي دَاوُدَ وَغَيْرِهِ مِنْ وَجْهٍ آخَرَ.
In another version by Al-Bukhari, he (ﷺ) said: "And perform ablution for every Salat (prayer)". Abu Dawud and others transmitted a similar narration.
Bulugh al-Maram, 142