Hazrat Mufti Mahmood Hasan Gangohi Saheb (rahmatullahi ‘alaih) would become very upset if he saw any of his associates contradicting a sunnah. Once, on the dastarkhaan, an ‘aalim, who was a student of Hazrat (rahmatullahi ‘alaih) needed to drink water. He took the glass in his left hand and placing his right hand under the glass started drinking the water. Hazrat (rahmatullahi ‘alaih) was very upset with him and addressed him firmly, saying, “Don’t you have a right hand?” He replied, “Hazrat, my right hand was messed with food, and I did not wish to dirty the glass.” Hazrat (rahmatullahi ‘alaih) angrily said to him, “Is this glass more valuable than the sunnah?” Thereafter he demonstrated the method of holding the glass by saying, “Lick your fingers after eating and hold the bottom of the glass by making a circle with your shahaadah finger and the thumb.” (Hazrat Mufti Mahmood Hasan Gangohi (rahmatullahi ‘alaih) – His life and works, pg. 119)