William Mardell Lynch's Sermon on the Book of Exodus notes. The sermon was first preached in Pharr, Texas on 15 January 1956. The Scripture reading is Exodus 19:4-6.
Sermon on the Book of Exodus, Box 11, Folder E, 2nd drawer, William Mardell Lynch Papers, 1915-2003. Center for Restoration Studies MS #16. Abilene Christian University Special Collections and Archives, Brown Library. Abilene Christian University, Abilene, TX.