The gemara [Sotah 3] learns from the pasuk יין ושכר אל תשת that a Nazir may not even drink mitzva wine. The gemara asks for an example of this and answers - Kiddush and Havdala wine. Then the gemara asks a question on that - see there....
Asks the Imrei Emes: Why isn't the example of mitzva wine - teruma wine, for there is a mitzva to drink such wine??
