Allahumma baarik lanaa fihi wa-atâ€™imanaa khayram minhu.
(Translation: Oâ€™ Allah grant us barakah in it, and feed us something better than it.)
Whenever Allah gives someone milk to drink one should read:
Allahumma baarik lanaa fihi wa-zidnaa minhu.
(Translation: Oâ€™ Allah grant us barakah in it and increase it for us.)
Sayyidinaa Ibn Abbas radiyallahu anhu says that after having something Rasoolullah sallallahu alaihe wasallam made duâ€™aa for something better than it. And after drinking milk he taught to make duâ€™aa for the increase of it, because Rasoolullah sallallahu alaihe wasallam said, There is nothing that serves both as food and water excepting milk.
Sayyidina Rasoolullah sallallahu alaihe wasallam chose to give the milk first to Sayyidina Ibn Abbas radiyallahu anhu because he was sitting on the right, and Sayyidina Khalid ibn Waleed radiyallahu anhu on the left. As is mentioned in many ahaadith that the cup etc. should be passed from right to left, Sayyidina Rasoollullah sallallahu alaihe wasallam requested the giving of preference to Sayyidina Khalid ibn Waleed radiyllahu anhu, as he was elder. It was also intended to educate Sayyidina Ibn Abbas radiyallahu anhu that, though it was his right, it is better to give an elder preference. But the love Sayyidina Ibn Abbas radiyallahu anhu had for Sayyidina Rasoolullah sallallahu alaihe wasallam naturally made him not give up this right for the left over milk of Sayyidina Rasoolullah sallallahu alaihe wasallam.