Supplication upon Drinking Milk and Rinsing after Drinking it

»Narrated Ibn Abbas: Allah's Apostle (Peace and blessings be upon Him) drank milk, rinsed his mouth and said, "It has fat." «([1])

»Ibn Abbas (May Allah Be Pleased with him) reported that the Messenger of Allah (Peace and blessings be upon Him) said:

"Whomever Allah feeds some food, he should say: 'Allahumma baarik lanaa fihi wa-at'imanaa khayram minhu.' (O Allah, bless it for us and feed us something better than it.)

And whomever Allah gives milk to drink, he should say: 'Allahummah barik lana feehi, wa zidna minhu' (O Allah, bless it for us and give us more of it) for I do not know of a more complete food or drink than milk.« ([2])

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([1]) Sahih al-Bukhari – Kitab al-Wudu' (112) – Sahih Muslim – Kitab al-Haydh (853).

([2]) Sunan ibn Majah – Kitab al-At'imah (2233), Sunan al-Tirmidhi – Kitab al-Da'wat (5543).