Jesus took the cup, saying, This is My blood (Matt 26; Mark 14, Luke 22). Also from the following:

He washeth His garment in wine, and His covering in the blood of grapes (Gen. 49:11). This refers to the Lord. Jehovah of Hosts shall make unto all people a feast of fat things, a feast of wine on the lees [or sweet wine] (Isa. 25:6). This refers to the sacrament of the holy supper to be instituted by the Lord. In the same:

Ho, everyone that thirsteth, come ye to the waters, and he that hath no silver come, buy and eat; yea, come, buy wine without silver (55:1). "The fruit of the vine" which they were to drink new in the kingdom of heaven (Matt. 26:29; Mark 14:25; Luke 22:17, 18), means no other than the truth of the New Church and of heaven. For this reason the church in many places in the Word is called a vineyard (as in Isa. 5:1-4; Matt. 20:1-13); and the Lord calls Himself "the true vine," and men who are engrafted into Him, "the branches" (John 15:1, 6); as also in other passages.