LSB #568 "If Your Beloved Son, O God"

Biblical citations in the hymnal:  Galatians 2:16; Ephesians 2:4-5, 8-9; Colossians 1:21-22

Galatians 2:16:  "yet we know that a person is not justified by works of the law but through faith in Jesus Christ, so we also have believed in Christ Jesus, in order to be justified by faith in Christ and not by works of the law, because by works of the law no one will be justified."

Ephesians 2:4-5:  "4 But God, being rich in mercy, because of the great love with which he loved us, 5 even when we were dead in our trespasses, made us alive together with Christ - by grace you have been saved"

Ephesians 2:8-9:  "8 For by grace you have been saved through faith.  And this is not your own doing; it is the gift of God, 9 not a result of works, so that no one may boast."

Colossians 1:21-22:  "21 And you, who once were alienated and hostile in mind, doing evil deeds, 22 he has now reconciled in his body of flesh by his death, in order to present you holy and blameless and above reproach before him"

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The text is public domain:

If Your beloved Son, O God,

Had not to earth descended

And in our mortal flesh and blood

Had not sin's power ended,

Then this poor, wretched soul of mine

In hell eternally would pine

Because of my transgression.

But now I find sweet peace and rest;

Despair no more reigns o'er me.

No more am I by sin oppressed,

For Christ has borne sin for me.

Upon the cross for me He died

That, reconciled, I might abide

With You, my God, forever.

I trust in Him with all my heart;

Now all my sorrow ceases.

His words abiding peace impart;

His blood from guilt released.

Free grace through Him I now obtain;

He washes me from ev'ry stain,

And pure I stand before Him.

All righteousness by works is vain;

The Law brings condemnation.

True righteousness by faith I gain;

Christ's work is my salvation.

His death, that perfect sacrifice,

Has paid the all-sufficient price;

In Him my hope is anchored.

My guilt, O Father, You have laid

On Christ, Your Son, my Savior.

Lord Jesus, You my debt have paid

And gained for me God's favor.

O Holy Spirit, Fount of grace,

The good in me to You I trace;

In faith and hope preserve me.

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The first two verses and the last verse all seem to come from Colossians 1:21-22.  The two passages from Ephesians appear in the third verse, specifically in the line "Free grace through Him I now obtain."  The two passages from Ephesians could also be cited for the fourth verse, but this verse draws more heavily from Galatians 2:16.