My LCMS Lutheran Church is starting to debate close or closed
communion. Some want us to open it up to all, others want it to stay
closed. I’m trying to find Scripture to support close communion. Can
you guys help?

First, this practice is not something that is up for debate or a vote in a congregation.  In the LCMS, close(d) communion is our practice.  Those that practice otherwise do so against our covenant of love and refuse to walk together as Synod.  It is the pastor’s duty to practice close(d) communion, whether the congregation likes it or not.  Congregations or pastors who do not wish to practice this are by virtue of breaking that covenant of love removing themselves from Synod, should make it official, leave Synod, and hand the keys over to those who are faithful in the congregation who can then call a faithful pastor.

As to the Scriptural basis, 1 Corinthians 10:16-17 and 1 Corinthians 11:17-34 are the primary places the Synod (and the Church for 2000 years) has pointed to as the seat of doctrine for the practice of close(d) communion.  You may also wish to read the following CTCR documents:
Theology and Practice of the Lord’s Supper –

Admission to the Lord’s Supper –

In addition, if you really want to do some digging, Werner Elert wrote a well researched book on this topic:

Eucharist and Church Fellowship in the First Four Centuries –

Matthew Lorfeld, Pastor
Messiah Lutheran Church
La Crescent, MN 


The Way Is Shut to Be Open