The following post-communion prayer combines elements of three prayers which seemed to have a common source.
our heavenly Father,
gracious and merciful Lord,
we give you thanks and praise
for the foretaste of the heavenly banquet
that you have given us to eat and to drink
in the body and blood of your dear Son,
With this, your sacrament,
strengthen and keep us in the true faith
all the days of our life.
Give us refreshment from our labors
with the peace of your forgiveness,
and comfort us in every trouble
until we eat and drink it anew
in your kingdom
at the marriage supper of the Lamb;
Jesus Christ our Lord,
who lives and reigns
with you and the Holy Spirit,
one God, now and forever.
Source: Written for A Collection of Prayers combining elements from: Common Worship, (Church of England) Funeral Eucharist, Lutheran Service Book (LCMS © 2006), Christian Worship Supplement (WELS © 2008)
I haven’t been able to identify a single source that contains all the content of this prayer. One older source that may be the source of this prayer is “O sacrum convivium” https://acollectionofprayers.wordpress.com/2018/06/10/o-sacred-banquet/