From the "May Singhi Breen Collection of Ukulele Solos" (New York: Robbins Music Corporation, 1955)—see the URL above:


BACK IN THE OLD SUNDAY SCHOOL
Phillips H. Lord, May Singhi Breen, Peter De Rose
New York: Leo Feist, Inc., 1932, 1955.

When we held our hymnbook together,
Back in the old Sunday school,
We sang ev'ry song,
Learned right from wrong,
Back in the old Sunday school.
I remember the time
Your hand clasped in mine,
Learning the sweet golden rule.
They taught us to love one another
Back in the old Sunday school.


[WorldCat.org indicates this is only the chorus; there is a missing verse beginning "Living in dreams of my childhood".]