“Heavenly Banquet”

I am not entirely sure what source you are referencing with your words in quotation marks. We do have some hymns in the Holy Communion section of Christian Worship: A Lutheran Hymnal that use similar language: “Heavn’ly bread” (309:2); “O Living Bread from heaven” (314:1); “This is the hour of banquet and of song; Here is the heav’nly table spread anew” (315:2); The last stanza of hymn 315 extends that imagery: “Feast after feast thus comes and passes by, Yet, passing, points to that glad feast above; Giving sweet foretaste of the festal joy; The Lamb’s great marriage feast of bliss and love.”

In Holy Communion, the Son of God from heaven gives us his body and blood, in, with and under the bread and wine. That same Lord spoke of looking forward to a heavenly meal with his followers (Luke 16:15-18). The prophet Isaiah also described God’s eternal love in the imagery of a great banquet (25:6-9).

We find all these thoughts in a prayer in Christian Worship: Supplement – “We give you thanks, O Lord, for the foretaste of the heavenly banquet that you have given us to eat and to drink in this sacrament. Through this gift you have fed our faith, nourished our hope, and strengthened our love. By your Spirit help us to live as your holy people until that day when you will receive us as your guests at the wedding supper of the Lamb, who lives and reigns with you and the Holy Spirit, one God, now and forever.”

So, perhaps, that prayer is what you were referencing. At any rate, I hope this helps your understanding.