The Lord's Supper is not the only instance of a meal of significance. Throughout Scripture there are pictures of meals of fellowship, covenant renewal and worship. Here, I would merely like to display a few of those pictures as they inform how we look at the Lord's Supper in a Biblical Theological manner.
Picture 1: Abraham and Melchizedek
The first instance in recorded Scripture of a shared meal of bread and wine is Abraham and Melchizedek in Genesis 14:18. Here, Abraham (then Abram) and the king of Sodom share a meal in celebration of a victory and Abraham gives a tenth of his wealth to Melchizedek. This precipitates a remembering of an oath,* perhaps a covenant oath, to God, and the praise of God for Abraham's provision.
Melchizedek is associated with Christ in the New Testament. The author of Hebrews, in chapter 7, cites this encounter (Heb 7:1-2; Gen 14:17-20), as a proof of the superiority of the order of Melchizedek, one whom Abraham paid tithes to as an inferior. Hebrew 7:22 then makes the connection to Christ, a priest after the order of Melchizedek, the guarantor of a better covenant. The parallels between Genesis 14 and Hebrews 7, as the relation between Abraham and Melchizedek in covenant, blessing and paying honor relate to Christ and the church. So also it would imply the communion enjoyed between Abraham and Melchizedek in the meal of wine and bread may also point forward to the communion enjoyed between Christ and the Church in the Supper of bread and wine.
[See Meredith Kline. Kingdom Prologue: Genesis Foundations for a Covenantal Worldview. (Eugene OR, Wipf and Stock Publishers, 2006), 312.)