Hawzah News Agency – Imam Sadiq peace be upon him says:

إنّ أميرَ المؤمنينَ عليه السلام كانَ لا يَقبَلُ شهادَةَ فَحّاشٍ، ولا ذِي مُخْزِيَةٍ في الدِّينِ.

 ‘Verily the Commander of the Faithful (AS) never used to accept the testimony of an obscene person, nor one who brought shame on religion through his disgraceful acts.’

Source: al-Kafi, v. 7, p. 396, no. 7