Translation
(1) Purification (Kitab Al-Taharah)
كتاب الطهارة
(55) Chapter: Separating Between The Madmadah and Istinshaq
(54) باب فِي الْفَرْقِ بَيْنَ الْمَضْمَضَةِ وَالاِسْتِنْشَاقِ
Sunan Abi Dawud 139 

Narrated Grandfather of Talhah:

I entered upon the Prophet (ﷺ) while he was performing ablution, and the water was running down his face and beard to his chest. I saw him rinsing his mouth and snuffing up water separately.

حَدَّثَنَا حُمَيْدُ بْنُ مَسْعَدَةَ، حَدَّثَنَا مُعْتَمِرٌ، قَالَ سَمِعْتُ لَيْثًا، يَذْكُرُ عَنْ طَلْحَةَ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ دَخَلْتُ - يَعْنِي - عَلَى النَّبِيِّ صلى الله عليه وسلم وَهُوَ يَتَوَضَّأُ وَالْمَاءُ يَسِيلُ مِنْ وَجْهِهِ وَلِحْيَتِهِ عَلَى صَدْرِهِ فَرَأَيْتُهُ يَفْصِلُ بَيْنَ الْمَضْمَضَةِ وَالاِسْتِنْشَاقِ ‏.‏
Grade :  Da'if (Al-Albani) ضعيف  (الألباني)حكم :
Reference : Sunan Abi Dawud 139
In-book reference : Book 1, Hadith 139
English translation : Book 1, Hadith 139