Narrated Abu Huraira:
The Verse:--"You (true Muslims) are the best of peoples ever raised up for mankind." means, the best of peoples for the people, as you bring them with chains on their necks till they embrace Islam. - Sahih:Al Bukhari:4557 (islam)

-Is it a figure of speech or is Mohamed promoting the offensive jihad?

Chapter: The sin of a person who sells a free man
Narrated Abu Huraira:
The Prophet (ﷺ) said, "Allah says, 'I will be against three persons on the Day of Resurrection: -1. One who makes a covenant in My Name, but he proves treacherous. -2. One who sells a free person (as a slave) and eats the price, -3. And one who employs a laborer and gets the full work done by him but does not pay him his wages.' " - Sahih:Al Bukhari:2227 (islam)

-Is there a fatwah from azarh about slavery (check google with حكم الاسترقاق في الاسلام الأزهر)?
- What is a free person, is a polytheist a free person, Is an idolater a free person in Islam?
- Can you just buy a slave at the market from a non-Muslim?

Chapter: Ghazwa of Khaibar
Narrated Abu Huraira:
When we conquered Khaibar, we gained neither gold nor silver as booty, but we gained cows, camels, goods and gardens. Then we departed with Allah's Messenger (ﷺ) to the valley of Al-Qira, and at that time Allah's Messenger (ﷺ) had a slave called Mid`am who had been presented to him by one of Banu Ad-Dibbab. While the slave was dismounting the saddle of Allah's Messenger (ﷺ) an arrow the thrower of which was unknown, came and hit him. The people said, "Congratulations to him for the martyrdom." Allah's Apostle said, "No, by Him in Whose Hand my soul is, the sheet (of cloth) which he had taken (illegally) on the day of Khaibar from the booty before the distribution of the booty, has become a flame of Fire burning him." On hearing that, a man brought one or two leather straps of shoes to the Prophet and said, "These are things I took (illegally)." On that Allah's Messenger (ﷺ) said, "This is a strap, or these are two straps of Fire." - Sahih:Al Bukhari:4234 (islam)

-Why Muslim claim Mohamed never has a Slaves?

Chapter: Is Land Included If A Person Vows To Give Up Wealth?
It was narrated that Abu Hurairah said:
"We were with the Messenger of Allah in the year of Khaibar, and we did not get any spoils of war except for wealth, goods and clothes. Then a man from Banu Ad-Dubaib, who was called Rifa'ah bin Zaid, gave the Messenger of Allah a black slave who was called Mid'am. The Messenger of Allah set out for Wadi Al-Qura. When we were in Wadi Al-Qura, while Mid'am was unloading the luggage of the Messenger of Allah, an arrow came and killed him. The people said: 'Congratulations! You will go to Paradise,' but the Messenger of Allah said: 'No, by the One in Whose hand is my soul! The cloak that he took from the spoils of war on the Day of Khaibar is burning him with fire.' When the people heard that, a man brought one or two shoelaces to the Messenger of Allah and the Messenger of Allah said: 'One or two shoelaces of fire.'" - Sahih:An Nasai:3827 (islam)

-Could Mohamed have warned his slave about that?

Chapter: A Slave Who Runs Away to the Land of Shirk
It was narrated that Jarir said:
"The Messenger of Allah [SAW] said: 'If a slave runs away, no Salah will be accepted from him until he goes back to his masters.'" - Sahih:An Nasai:4049 (islam)

-Is it a proof that muslim can be slave?

Chapter: A Slave Who Runs Away to the Land of Shirk
Jarir used to narrate from the Prophet [SAW]:
"If a slave runs away, no Salah will be accepted from him, and if he dies he will die a disbeliever." A slave of Jarir's ran away, and he caught him and struck his neck (killing him). - Sahih:An Nasai:4050 (islam)

-Can you execute your own slave for running away?
- Is it valid today or is it a war crime?

Chapter: Calling a runaway slave a kafirg
Jarir b. Abdullah reported it from the Holy Prophet:
When the slave runs away from his master, his prayer is not accepted. - Sahih:Muslim:70 (islam)

-What if your prayer is not accepted, does it mean you cannot go to Paradise?
- Are we talking about a Prayer to Allah or are we talking about a prayer to other Gods?
- Does it mean Muslim can be slave?

But let them who find not [the means for] marriage abstain [from sexual relations] until Allah enriches them from His bounty. And those who seek a contract [for eventual emancipation] from among whom your right hands possess - then make a contract with them if you know there is within them goodness and give them from the wealth of Allah which He has given you. And do not compel your slave girls to prostitution, if they desire chastity, to seek [thereby] the temporary interests of worldly life. And if someone should compel them, then indeed, Allah is [to them], after their compulsion, Forgiving and Merciful. - Quran:An-Nur 24:33 (islam)

-Is Allah forgiving to her or to the one who forces them?
- Is it really a deterrent to force prostitution for Slaves?
- Is it linked to the grooming gangs in England?

Servants, be obedient to them that are your masters according to the flesh, with fear and trembling, in singleness of your heart, as unto Christ; - Bible:NT:Ephesians 6:5 (bible)

-Are we in the new covenant?
- Is it valid today?
- Is Christianity ok with slavery?

[7]And the angel of the LORD found her by a fountain of water in the wilderness, by the fountain in the way to Shur.
[8]And he said, Hagar, Sarai's maid, whence camest thou? and whither wilt thou go? And she said, I flee from the face of my mistress Sarai.
[9]And the angel of the LORD said unto her, Return to thy mistress, and submit thyself under her hands. - Bible:OT:Genesis 16:7:9 (bible torah)

-Is God for or against slavery?
- Is it only for this slave in particular?
- Can you trust the text itself?

There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus. - Bible:NT:Galatians 3:28 (bible)

-Are we equal in Christ or in life?
- Is female equal to male, gentiles equal to jews?