Mr. MADISON thought it wrong to admit in the Constitution the idea that there could be property in men. The reason of duties did not hold, as slaves are not like merchandize, consumed, &c
Notes from Wikiquote
Madison, in convention, when an attempt was made to introduce the term slave into the Constitution, said: "It must not be so; because we intend this Constitution to be the great charter of human liberty to the unborn millions who shall enjoy its protection, and who should never see that such an institution as slavery has ever known in our midst." | As paraphrased or quoted in Our National Condition, and Its Remedy : A Sermon, Preached in the Pine Street Church, Boston, on Sunday, June 22, 1856 (1856) by Henry Martyn Dexter | Madison said he "thought it wrong to admit in the Constitution the idea that there could be property in man. We intend this Constitution to be the great charter of human liberty to the unborn millions who may enjoy its protection, and who shall never see that such an institution was ever known in their midst. | As paraphrased or quoted in Reminiscences of James A. Hamilton: Or, Men and Events, at Home and Abroad (1869), Appendix D, Property in Man, p. 625