Gabay graduated with distinction from the Hebrew University of Jerusalem Law School, and gained his first professional experience under Justice Moshe Landau and Justice Alfred Vitkon. Gabay was one of a group of promising assistants to Prof Justice Zeev Tzeltner, one of the founders of the Tel Aviv University faculty of Law. Gabay assisted Tzeltner to publish his book on contract law. In 1961 Gabay won a Fulbright scholarship and subsequently received a master's degree in Comparative Law from Columbia University, New York. He did a major study on International Transactions at the London School of Economics.
