יָדוּעַ לְכָל בַּר בֵּי רַב

ביטוי (אנגלית)

Known to every learned person/ something every schoolboy knows

הגדרה (אנגלית)

Something known to every person of understanding; elementary knowledge. (In Aramaic, "bar bei rav" means a student of a scholar.)

("Bar bei rav who sat in a fast on the eve of Shabbat—what is the ruling on completing it?" — Eruvin 40b; and: "It is known to every bar bei rav that I did not go into exile like ordinary people, because I did not go into a place of Torah; and from the start they have always been enemies of the Torah and its students" — Nachalat Shiv'a, Teshuvot Chadashot, סימן ו; and: "Already every bar bei rav is chattering in the language of ichthyologists, who say that all those who were in the company of Jonah in the belly of the fish had already perished from the world, and not even a single fish remained of them" — Agnon, City and All That Is In It, 628; and: "The words of Zmora are already known to every bar bei rav in his ruling on the first criminal appeal that came before the Supreme Court" — Justice Haim Cohen, Selected Writings, Bursi 1992, 272)