Bulugh al-Maram
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