Manava Dharmashastra 12.111

12.111

traividyo hetukas tarkī nairukto dharmapāṭhakaḥ
trayaś cāśramiṇaḥ pūrve pariṣat syād daśāvarā //

Three persons who each know one of the three principal Vedas, a logician, a Mimamsaka, one who knows the Nirukta, one who recites (the Institutes of) the sacred law, and three men belonging to the first three orders shall constitute a (legal) assembly, consisting of at least ten members.