“Firuz Shah Tughlaq organised an industry out of catching slaves. Shams-i-Siraj Afif writes in his Tarikh-i-Firuz Shahi: “The Sultan commanded his great fief-holders and officers to capture slaves whenever they were at war (that is, suppressing Hindu rebellions), and to pick out and send the best for the service of the court. The chiefs and officers naturally exerted themselves in procuring more and more slaves and a great number of them were thus collected. When they were found to be in excess, the Sultan sent them to important cities… It has been estimated that in the city and in the various fiefs, there were 1,80,000 slaves… The Sultan created a separate department with a number of officers for administering the affairs of these slaves.”. Firuz Shah beat all previous records in his treatment of the Hindus… He records another instance in which Hindus who had built new temples were butchered before the gate of his palace, and their books, images, and vessels of Worship were publicly burnt. According to him “this was a warning to all men that no zimmi could follow such wicked practices in a Musulman country”. Afif reports yet another case in which a Brahmin of Delhi was accused of “publicly performing idol-worship in his house and perverting Mohammedan women leading them to become infidels”. The Brahmin “was tied hand and foot and cast into a burning pile of faggots.””

Lal, K. S. (1992). The legacy of Muslim rule in India. New Delhi: Aditya Prakashan. Chapter 7

Lal, K. S. (1994). Muslim slave system in medieval India. New Delhi: Aditya Prakashan. Chapter 5 (quoting Masalik-ul-Absar, E.D., III, 580., Battutah)

Shams Siraj Afif quoted in Lal, K. S. (1994). Muslim slave system in medieval India. New Delhi: Aditya Prakashan. Chapter 5

S.R. Goel, The Story of Islamic Imperialism in India

Shams Siraj Afif, quoted in Lal, K. S. (1999). Theory and practice of Muslim state in India. New Delhi: Aditya Prakashan. Chapter 3

A Human Being Cannot Be Justly Owned (1835)
Context: The slave-holder claims the slave as his Property. The very idea of a slave is, that he belongs to another, that he is bound to live and labor for another, to be another’s instrument, and to make another’s will his habitual law, however adverse to his own. Another owns him, and, of course, has a right to his time and strength, a right to the fruits of his labor, a right to task him without his consent, and to determine the kind and duration of his toil, a right to confine him to any bounds, a right to extort the required work by stripes, a right, in a word, to use him as a tool, without contract, against his will, and in denial of his right to dispose of himself, or to use his power for his own good. “A slave,” says the Louisiana code, “is in the power of the master to whom he belongs. The master may sell him, dispose of his person, his industry, his labor; he can do nothing, possess nothing, nor acquire any thing, but which must belong to his master.” “Slaves shall be deemed, taken, reputed, and adjudged,” say the South-Carolina laws, “to be chattels personal in the hands of their masters, and possessions to all intents and purposes whatsoever.” Such is slavery, a claim to man as property. Now this claim of property in a human being is altogether false, groundless. No such right of man in man can exist. A human being cannot be justly owned. To hold and treat him as property is to inflict a great wrong, to incur the guilt of oppression.

Shams Siraj Afif cited in Lal, K. S. (1994). Muslim slave system in medieval India. New Delhi: Aditya Prakashan. Chapter 12

Attributed to Tubman in Dorothy Winbush Riley, My Soul Looks Back 'Less I Forget https://books.google.com/books?id=KpcLAQAAMAAJ&focus=searchwithinvolume&q=%22c.+1865%22 p. 148 (1993). Riley gives a date of "c. 1865" but offers no citation. No source from earlier than 1993 is known. Quoted in Africana: The Encyclopedia of the African and African American Experience (1999) by Henry Louis Gates and Kwame Anthony Appiah, p. 299. Tubman specialists like Jean H. Humez and Kate Clifford Larson deem this one completely spurious. See "Bogus Tubman," by Steve Perisho http://liberlocorumcommunium.blogspot.com/2014/03/bogus-tubman-i-freed-thousands-of.html.<!-- Someone cited this as being in Harriet, The Moses of Her People (1886) by Sarah H. Bradford, but it does not occur in the editions available online. -->
Disputed
Variant: I freed thousands of slaves. I could have freed thousands more, if they had known they were slaves.

Source: Muslim Slave System in Medieval India (1994), Chapter 12