Ablution (Wudu) Bulugh al-Maram 39
Arabic hadith text
وَلِأَبِي دَاوُدَ فِي رِوَايَةٍ: { إِذَا تَوَضَّأْتَ فَمَضْمِضْ } 1 .1 - صحيح. سنن أبي داود (144) .
Translation
In another verson of Abu Da’ud is
“If you perform ablution rinse your mouth”.