كتاب الطهارة
1  
The Book of Purification
(10)
Chapter: Menstruation
(10)
باب الحيض
Bulugh al-Maram 142
In another version by Al-Bukhari, he (ﷺ) said:
"And perform ablution for every Salat (prayer)". Abu Dawud and others transmitted a similar narration.
وَفِي رِوَايَةٍ لِلْبُخَارِيِّ: { وَتَوَضَّئِي لِكُلِّ صَلَاةٍ } وَهِيَ لِأَبِي دَاوُدَ وَغَيْرِهِ مِنْ وَجْهٍ آخَرَ.‏

Reference : Bulugh al-Maram 142
In-book reference : Book 1, Hadith 171
English translation : Book 1, Hadith 153