Sayyiduna Jabir (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) drank milk and then rinsed his mouth because of its fat.
Imam al-Bazzar recorded this report; its chain contains a narrator, Ayyub bin Sayyar, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1311