Susan, you're right. The verse is from a different song, in Mom's church (Old Regular Baptist) it's known as, "The Day is Past and Gone." The first two verses:

The day is past and gone,
The evening shades appear;
O may we all remember well
The hour of death is near.

We lay our garments by,
Upon our beds to rest-
So time will soon disrobe us all
Of what we now possess.

Wish you could hear the melody- it's a gorgeous old swoopy, decorated, minor-modal one.

I did write to Bill Moyers, with this information, but apparently no one really cared about the source of the verse, or, it was just too late by then to make any corrections.

But, as someone else said, verses are always travelling, and I suppose there's no protection (or law) against it happening in sacred music, as well as all other! Jean