Manusmriti

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आप्ताः सर्वेषु वर्णेषु कार्याः कार्येषु साक्षिणः । सर्वधर्मविदोऽलुब्धा विपरीतांस्तु वर्जयेत् ॥ ६३ ॥

sanskrit

Trustworthy men of all the (four) castes (varna) may be made witnesses in lawsuits, (men) who know (their) whole duty, and are free from covetousness; but let him reject those (of an) opposite (character).

english translation

AptAH sarveSu varNeSu kAryAH kAryeSu sAkSiNaH | sarvadharmavido'lubdhA viparItAMstu varjayet || 63 ||

hk transliteration by Sanscript