Not permissible to sell alcohol to non-Muslims
Question

                Assalaam Aleikum,Is it sinful to buy liqor or other Alcoholic drinks to non muslims? As 
for myself I have never even tested alcohol and would discourage other muslims from 
doing so.
Praise be to Allah.al-hamdu lillaah. 
It is not permissible for a Muslim to sell wine (or any other intoxicating substance) to non-Muslims, 
because the Prophet 
 (peace be upon him) said:
"Verily when Allaah forbids something, he forbids its price" 
(i.e. forbids earning money from it). The Prophet 
 also cursed ten types of people relating to the 
issue of wine, among them the one who sells it. In addition, selling it would be assisting and abetting 
people in sin and transgression, and Allaah the Almighty has said (interpretation of the meaning): 
...and do not aid and abet one another in sin and transgression. (al-Maa'ida 5:2) 
It is incumbent upon you to advise those who have fallen into this evil among the Muslims, that he 
should repent to Allah the Most Glorified and desist this practice.