I am returning to the original topic of the part 1 of this thread -- "Come, Thou Fount of Every Blessing" by Robert Robinson (1758),

I have found a fragment of it embedded in a gospel song by the Norfleet Brothers, which is remarkable, to my mind. Here is the relevant information.

The Norfleet Brothers have inserted this verse in two parts, in a well-known African-American (Baptist) Gospel song variously known as "None But the Righteous," "Take Me to the Water' and "Baptize Me". Their version is titled "None But the Righteous."

https://www.youtube.com/watch?v=P87a5l4dqHk

Their intro and verse 3 constitute a broken floating verse from
"Come, Thou Fount of Every Blessing" by Robert Robinson (1758),
originally sung as follows:

Prone to wander, Lord, I feel it
Prone to leave the God I love
Here’s my heart, O take and seal it,
Seal it for Thy courts above.

Note that "leave" in the original has become "serve" in the Norfleet's intro
and "for thy courts" has become "from the courts" intheir verse 3.

They sing it as two extended couplets:

Prone to wander, Lord, I feel it
Prone to serve the God I love

Well, right here is my heart
(my heart, my heart)
Well, take and seal it
(seal it, seal it)
Oh, now, seal it from the
(from the, from the)
From the courts above
(the courts above)

I have the entirety of their version transcribed and will find a "Baptize Me" / "None But the Righteous" thread somewhere around here in which to post the text.

Compare:
http://cyberhymnal.org/htm/c/o/comethou.htm

Enjoy the wonderful word of variant stanzas!