This is that sin of sins

This is that sin of sins,
That mortal blasphemy,
Ascribing to the devils’ prince
The wonders wrought by thee!
But from its guilt secure
In thee our souls we hide;
And trust thy blood to make us pure
From every sin beside.

Hymnal/Album: Originally titled “The blasphemy against the Holy Ghost, shall not be forgiven.”—[Matt.] xii. 31. Introduced in Charles Wesley, Short Hymns on Select Passages of the Holy Scriptures, Vol. 2 (Bristol: Farley, 1762). Published in The Poetical Works of John and Charles Wesley, Collected and Arranged by G. Osborn, Vol. 10 (London: Wesleyan-Methodist Conference Office, 1870), page 263.
Publishing: Public Domain