Hymn Lyrics Search - Name That Hymn

My sister has been trying to find a song we used to sing at a summer camp we went to. The director would write the lyrics on posterboard and animatedly sing along

Songs like I am a C, I am a Ch, I am a Christian, and a song about David and Goliath

The one we can't find, she believes starts like this

There was a man, he had a plan. That he'd build him a house, a house that was brand new. So he looked around, found a piece of ground, and thought this'll do

Any help would be appreciated. Sounds like it's about Matthew 7 or Job, but I've had no luck finding a song remotely similar

Any idea how the chorus goes?

Title: Rock on Rock
Author Terry Camsey, Janette Smart

First line Self thi'sll do so he dug foundations deep down
Chorus: There was a man, he had a plan that he would build a house

Info from here.
https://www.lillenasdrama.com/nphweb/ht ... ndex=title

Lyrics here, also a link to melody part.

https://youtu.be/r1T1n_Xa2Tk?si=vPSOQ_NEVSPpfYWH