In 1788, Rev. Raymund Harris published this tract: “Scriptural researches on the licitness of the slave trade[…].” And in it, he said this:
"The [Revealed] Decisions of God have positively declared that the Slave-Trade is intrinsically good and licit, [and that the holding of slaves] is perfectly consonant to the principles of the Law of Nature, the Mosaic Dispensation, and the Christian Law." Slavery has "the positive sanction of God in its support."