Imam Ali (AS) said, There is no good in the testimony of the treacherous.
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : لاخَيْرَ في شَهادَةِ خائِن
Similar narrations
Maʿānī al-ʾAkhbār #3533. The Prophet, Allah’s blessings be upon him and his Family: The testimony of a traitorous male or traitorous female is impermissible, nor...