See Jerusalem Talmud, Berakhat 8:12a, 52ff. and the sources discussed in Otfried Hofius, “The Lord’s Supper and the Lord’s Supper Tradition,” One Loaf, One Cup: Ecumenical Studies of 1 Cor 11 and Other Eucharistic Texts, ed. Ben Meyer (Macon, GA Mercer Univ. Press, 1993), pp. 75–115.