Is it permissible to delay returning salaams because of enmity?
Question

                There is personal enmity between me and another person. If he greets me with salaam, is it permissible for me to respond after he has gone away, or do I have to return his salaam immediately?
Praise be to Allah.The Hanafis and Shaafa’is are of the view that it is obligatory to 
          return the salaams immediately.  
Ibn ‘Aabideen said: delaying returning the salaam for no valid reason 
          is makrooh tahreeman (very makrooh or disliked to the point of being 
          almost haraam). The sin is not lifted by returning the salaam, but by 
          repentance.