The English Confession:

Thus of His free mercy, without compulsion, he offered up himself as the only sacrifice to purge the sins of all the world, so that other sacrifices for sins are blasphemous, and derogate from the sufficiency thereof.

[Source: Reformed confessions of the 16th century, ed., by Arthur C., Cochrane, (Philadelphia, Westminster Press 1966), 132. The English Confession of Faith Used in the English Congregation at Geneva, 1556, written by the English exiles during the reign of Mary. John Knox also signed this confession and thus it can be found in the Works of John Knox. Interestingly, this confession was also received and approved by the then Church of Scotland.]