The Law Code of Bṛhaspati 1.1.60

1.1.60

kuryād alagnakau rakṣed arthiprathyarthinau sadā /
etad daśāṅgaṃ karaṇaṃ yasyām adhyāsta pārthivaḥ //

That judicial assembly is equal (in sanctity) to a sacrificial meeting in which there sit seven or five or three Brahmans, who are acquainted with the world, with (the contents of) the Veda, and with law.