Ahmed bin Suliaman أحمد بن سليمان · The Book of Fighting [The Prohibition of Bloodshed]

"When the Messenger of Allah , I will fight them for withholding it.' 'Umar, may Allah be pleased with him, said: 'By Allah, as soon as I realized that Allah has expanded the chest of Abu Bakr for fighting, I knew that it was the truth.'"

"The Messenger of Allah say such and such?' He said: 'By Allah, I do not separate Salah and Zakah, and I will fight whoever separates them.' So we fought alongside him, and we realized that that was the right thing."

'Amr bin Aws told him that his father Aws said: "The Messenger of Allah said: 'I have been commanded to fight the people until they bear witness to La ilaha illallah (there is none worthy of worship except Allah), then their blood and their wealth become forbidden to me, except for a right that is due."

"Aishah said: 'Do you not know that the Messenger of Allah said: It is not permissible to shed the blood of a Muslim, except a man who committed adultery after being married, or one who reverted to Kufr after becoming Muslim, or a life for a life.'"

From the Messenger of Allah : "The Verse about Al-Muharabah was revealed concerning them."

"The Messenger of Allah said: 'Whoever ties a know and blows on it, he has practiced magic; and whoever practices magic, he has committed Shirk; and whoever hangs up something (as an amulet) will be entrusted to it.'"

"Defaming a Muslim is evildoing and fighting him is Kufr." (Sahih Mawquf)