"On Galilee's High Mountain"

About a year and a half ago, I noticed a small feature in "On Galilee's High Mountain," sung to the tune "Missionary Hymn."

Here's the first musical phrase:

The hymn starts with the lines "On Galilee's high mountain / Christ gave the great command."  Illustrating the word's meaning, "high" is sung to the highest pitch in this phrase (C).