700. hadíth
وَ فِي حَدِيثٍ آخَرَ قَالَ: "لاَ يَجُوزُ شَهَادَةُ اَلْمُرِيبِ وَ اَلْخَصْمِ وَ دَافِعِ مَغْرَمٍ أَوْ أَجِيرٍ أَوْ شَرِيكٍ، أَوْ مُتَّهَمٍ أَوْ تَابِعٍ وَ لاَ تُقْبَلُ شَهَادَةُ شَارِبِ اَلْخَمْرِ وَ لاَ شَهَادَةُ اَللاَّعِبِ بِالشِّطْرَنْجِ وَ اَلنَّرْدِ وَ لاَ شَهَادَةُ اَلْمُقَامِرِ".
And in another narration, Imam (a.s) said: "The testimony of the one who arouses suspicion (Al-Mureeb), the adversary (Al-Khasm), the one evading a financial obligation (Dafi' Maghram), the hired worker (Ajir), the business partner (Shareek), the accused (Mutaham), or the follower (Tabi') is not valid. Furthermore, the testimony of a wine drinker (Sharib Al-Khamr), a player of chess (Shatranj) and dice (Nard), and a gambler (Muqamir) is not accepted."