I will not let Thee go, except Thou bless me.@Genesis 32:26
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John Newton (1725–1807)

John New­ton, Ol­ney Hymns (Lon­don: W. Ol­iv­er, 1779), Book 1, num­ber 10. My name is Jacob. Some hym­nals change the first line to Lord, I can­not let Thee go.

Sey­mour, from the op­e­ra Ob­er­on, by Carl M. von We­ber, 1826. Hen­ry W. Great­or­ex pub­lished it as a hymn tune in 1851 (🔊 pdf nwc).

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Jacob Wrestling with an Angel
Gustave Doré (1832–1883)

Nay, I cannot let Thee go,
Till a blessing Thou bestow:
Do not turn away Thy face,
Mine’s an urgent, pressing case.

Dost Thou ask me who I am?
Ah! my Lord, Thou know’st my name!
Yet the question gives a plea,
To support my suit with Thee.

Thou didst once a wretch behold,
In rebellion blindly bold;
Scorn Thy grace, Thy power defy,
That poor rebel, Lord, was I.

Once a sinner, near despair,
Sought Thy mercy seat by prayer;
Mercy heard, and set him free,
Lord, that mercy came to me.

Many days have passed since then,
Many changes I have seen;
Yet have been upheld till now;
Who could hold me up but Thou?

Thou hast helped in every need;
This emboldens me to plead;
After so much mercy past,
Canst Thou let me sink at last?

No—I must maintain my hold,
’Tis Thy goodness makes me bold;
I can no denial take,
When I plead for Jesu’s sake.