In 1818, Rev. Jacob Gruber stood before thousands of people at a Methodist camp meeting in Maryland and openly condemned slavery. He called the institution a “national sin” and warned that it was offensive to God and harmful to the nation. His sermon angered powerful slaveholders, and within months Gruber was arrested and charged with attempting to incite enslaved people to rebellion.
Jacob Gruber was born in Pennsylvania on February 3, 1778, to a family of German descent. He became a Methodist as a teenager and entered the Methodist ministry in 1800. He spent much of his career as an itinerant preacher, traveling extensively through Pennsylvania and surrounding states. Historical Methodist accounts describe him as an energetic preacher who spent decades serving churches and Methodist districts.
By 1818, Gruber was serving as a presiding elder in the Carlisle District, whose territory extended into Maryland. That year, he attended a Methodist camp meeting in Washington County, Maryland, where he was called upon to preach. The audience was large, consisting of several thousand white people and several hundred Black people, according to the record of his later trial.
Gruber chose his words carefully, but he did not avoid the subject of slavery.
His sermon was based on Proverbs 14:34: “Righteousness exalteth a nation, but sin is a reproach to any people.” From that text, he moved from individual morality to what he considered the sins of the nation. Slavery, he argued, belonged among them. The official account of his trial records that Gruber described slavery as a “national sin” that was detrimental to the interests of both the nation and individuals and “awfully offensive” in the sight of God.
Gruber’s condemnation was particularly striking because he was speaking in Maryland, where slavery was legal and deeply embedded in society.
He challenged the contradiction between American ideals of liberty and the existence of human bondage. One of the most memorable lines attributed to his sermon asked whether it was not a reproach for a man to “hold articles of liberty and independence in one hand and a bloody whip in the other.”
His position was not simply that individual slaveholders should behave more humanely. He was attacking slavery as an institution and placing the responsibility for it within a broader moral and national framework.
That made the sermon politically dangerous.
Arrest and Trial
About two months after the sermon, authorities arrested him after prominent local slaveholders sought action against him. He was accused of attempting to incite enslaved Africans to “mutiny and rebellion.” The Library of Congress preserves the 1819 published record of the case, which identifies the prosecution as a misdemeanor case involving an alleged attempt to incite a slave insurrection through his sermon.
The case was moved from Washington County to Frederick County, where Gruber would stand trial. The change of venue was significant because opposition to him was strong in the area where he had preached.
Among the lawyers who defended him was Roger B. Taney, a Maryland lawyer who would later become Chief Justice of the United States Supreme Court. Taney argued the case with other members of Gruber’s defense team, focusing on the preacher’s intentions and the actual content of his sermon.
The prosecution had to establish that Gruber’s words constituted a criminal attempt to provoke enslaved people into rebellion, rather than a religious condemnation of slavery.
The case therefore went beyond Gruber himself. It placed the language of antislavery preaching before a court in a state where slavery remained legal.
In 1819, after the trial in Frederick County Court, the jury acquitted Jacob Gruber.
The surviving trial record describes the jury as becoming convinced of his innocence even before his lawyers completed their arguments.
His acquittal did not weaken slavery’s legal position in Maryland. Enslaved Africans remained legally held in bondage, and the institution continued for decades afterward.
Gruber’s case is significant because it illustrates the complicated relationship between Christianity, slavery and freedom in the United States.
Christianity had been used by defenders of slavery to justify the institution, often through biblical passages concerning servants and masters. At the same time, Christian ministers such as Gruber used their understanding of scripture to reach the opposite conclusion. They argued that slavery was morally incompatible with Christian principles and that a nation could not claim righteousness while permitting human beings to be owned.
Gruber’s sermon did not end slavery, and his prosecution did not transform Maryland’s laws. His significance lies elsewhere. He demonstrated that opposition to slavery existed inside the Christian institutions of the period and that some ministers were willing to confront slaveholding society directly, even when doing so brought legal consequences.
Sources:
https://tile.loc.gov/storage-services/service/rbc/rbcmisc/lst/lst0094/lst0094.pdf
