The ruling on burning the disbelieving enemy with fire and mutilating them

Question:
Burning the enemy with fire, the disbelievers?

Answer:
No, they are not burned unless they burn.
Q: Meaning, by way of retaliation?
A: Yes.
Q: Is mutilation the same?
A: By way of retaliation, yes, but leaving off mutilation is better; because of his saying (peace and blessings be upon him): .
Q: Even if they mutilate?
A: Leaving it off is better, even if they mutilate.
Q: Did 'Ali ibn Abi Talib (may Allah be pleased with him) burn his followers?
A: The Companions (may Allah be pleased with them) disapproved of him. In the intensity of his anger at them, he dug trenches in the fire for them and tortured them; because they said: "You are Allah"—may Allah keep us safe from that. So in the intensity of his anger at them, he burned them. But as Ibn 'Abbas said: "If he had killed them with the sword, that would have been better." And this is the obligatory thing; because the words of the Prophet (peace and blessings be upon him) are not preceded by anyone, not the words of 'Ali, nor anyone other than 'Ali. The words of the Prophet (peace and blessings be upon him) are given precedence over everyone.