'Abdullah ibn 'Amr ibn al-'as said, "Do not greet anyone who drinks wine."  

عَنْ عَبْدِ اللهِ بْنِ عَمْرِو بْنِ الْعَاصِ قَالَ لاَ تُسَلِّمُوا عَلَى شُرَّابِ الْخَمْرِ  

Al-Hasan said, "There should be not sense of respect between you and a deviant person."  

عَنِ الْحَسَنِ قَالَ لَيْسَ بَيْنَكَ وَبَيْنَ الْفَاسِقِ حُرْمَةٌ  

'Ali ibn 'Abdullah was heard expressing his dislike for chess and said, "Do not greet someone who plays it. It is a kind of gambling."  

أَنَّهُ سَمِعَ عَلِيَّ بْنَ عَبْدِ اللهِ يَكْرَهُ الأَسْبِرَنْجَ وَيَقُولُ لاَ تُسَلِّمُوا عَلَى مَنْ لَعِبَ بِهَا وَهِيَ مِنَ الْمَيْسِرِ