I don't know if this is the song you're looking for but I pray that this helps.

Here I Am

Verse: 1
On that resurrection morning, when the redeemed are gathering in,
I'll be in that royal number, when they call my name,
when they all join in and sing, hallelujah to the king,
I'll cry with a joyful sound Lord here I am.

Chorus:
Here I am, here I am, I'm the one the shepherd left the fold and found,
there were ninety and nine, but he left the fold to find,
one little lost lamb and here I am.

Verse: 2
When ole Gabriel blows the trumpet, and we rise up in the air,
in less time than a split second, we'll be changed from here to there,
where there'll be no grief or pain, perfect peace and joy shall reign,
home at last I shall proclaim Lord here I am.

I am looking for the music anf lyrics to "I'm a Lambe the Shepard left the flock for"