Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tirmidhi:89 – Qutaybah > al-Layth > ʿUqayl > al-Zuhrī > ʿUbaydullāh b. ʿAbdullāh > Ibn ʿAbbās

the Prophet drank milk. Then he called for water to rinse out his mouth. Then he said: "Indeed it has fat." [He said:] There are narrations on this topic from Sahl bin Sa'd As-Sa'idi and Umm Salamah. Abu Eisa said: [And] this Hadith is Hasan Sahih. Some of the people of knowledge held the view that one is to wash the mouth after drinking milk and this is recommended according us. Some others did not hold the view that one is to wash out the mouth after drinking milk.  

الترمذي:٨٩ – حَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا اللَّيْثُ عَنْ عُقَيْلٍ عَنِ الزُّهْرِيِّ عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ عَنِ ابْنِ عَبَّاسٍ

أَنَّ النَّبِيَّ ﷺ شَرِبَ لَبَنًا فَدَعَا بِمَاءٍ فَمَضْمَضَ وَقَالَ إِنَّ لَهُ دَسَمًا قَالَ وَفِي الْبَابِ عَنْ سَهْلِ بْنِ سَعْدٍ السَّاعِدِيِّ وَأُمِّ سَلَمَةَ  

قَالَ أَبُو عِيسَى وَهَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ وَقَدْ رَأَى بَعْضُ أَهْلِ الْعِلْمِ الْمَضْمَضَةَ مِنَ اللَّبَنِ وَهَذَا عِنْدَنَا عَلَى الاِسْتِحْبَابِ وَلَمْ يَرَ بَعْضُهُمُ الْمَضْمَضَةَ مِنَ اللَّبَنِ

See similar narrations below:

Collected by Abū Dāwūd, Aḥmad, Ibn Ḥibbān
abudawud:196 – Qutaybah b. Saʿīd > al-Layth > ʿAqīl > al-Zuhrī > ʿUbaydullāh b. ʿAbdullāh > Ibn ʿAbbās

it contains greasiness.  

أبو داود:١٩٦ – حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا اللَّيْثُ عَنْ عَقِيلٍ عَنِ الزُّهْرِيِّ عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ عَنِ ابْنِ عَبَّاسٍ

أَنَّ النَّبِيَّ ﷺ شَرِبَ لَبَنًا فَدَعَا بِمَاءٍ فَتَمَضْمَضَ ثُمَّ قَالَ إِنَّ لَهُ دَسَمًا  

ahmad:3050 – Muḥammad b. Muṣʿab > al-Awzāʿī > al-Zuhrī > ʿUbaydullāh b. ʿAbdullāh > Ibn ʿAbbās

The Apostle ﷺ took milk and then called for water and rinsed (his mouth) and said: It contains greasiness. (Using translation from Muslim 358a)  

أحمد:٣٠٥٠ – حَدَّثَنِي مُحَمَّدُ بْنُ مُصْعَبٍ حَدَّثَنَا الْأَوْزَاعِيُّ عَنِ الزُّهْرِيِّ عَنِ عُبَيْدِ اللهِ بْنِ عَبْدِ اللهِ عَنِ ابْنِ عَبَّاسٍ

أَنَّ رَسُولَ اللهِ ﷺ شَرِبَ لَبَنًا ثُمَّ دَعَا بِمَاءٍفَمَضْمَضَ وَقَالَ إِنَّ لَهُ دَسَمًا  

ذِكْرُ الْبَيَانِ بِأَنَّ شُرْبَ اللَّبَنِ لَا يُوجِبُ عَلَى شَارِبِهِ وُضُوءًا

ibnhibban:1159 – Isḥāq b. Ibrāhīm b. Ismāʿīl > Qutaybah b. Saʿīd > al-Layth b. Saʿd > ʿAqīl > al-Zuhrī > ʿUbaydullāh > Ibn ʿAbbās

it contains greasiness. (Using translation from Abū Dāʾūd 196)  

ابن حبّان:١١٥٩ – أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ بْنِ إِسْمَاعِيلَ قَالَ حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا اللَّيْثُ بْنُ سَعْدٍ عَنْ عَقِيلٍ عَنِ الزُّهْرِيِّ عَنْ عُبَيْدِ اللَّهِ عَنِ ابْنِ عَبَّاسٍ

أَنَّ النَّبِيَّ ﷺ شَرِبَ لَبَنًا فَدَعَا بِمَاءٍ فَتَمَضْمَضَ وَقَالَ «إِنَّ لَهُ دَسَمًا»