GodlyVerses

“Whenever he
appointed a man to lead a military detachment, the Messenger of Allah
(ﷺ) would advise him especially to fear Allah and treat the Muslims
with him well. He (ﷺ) said: ‘Fight in the Name of Allah and in
the
cause of Allah. Fight those how disbelieve in Allah. Fight but do
not
be treacherous, do not steal from the spoils of war, do not
mutilate
and do not kill children. When you meet your enemy from
among the
polytheists, call them to one of three things. Whichever of
them they
respond to, accept it from them and refrain from fighting
them. Invite
them to accept Islam, and if they respond then accept it
from them and
refrain from fighting them. Then invite them to leave
their land and
move to the land of the polytheists. Tell them that if
they do that,
then they will have the same rights and duties as the
polytheists. If
they refuse, then tell them that they will be like
the Muslim Bedouins
(who live in the desert), subject to the same
rulings of Allah as the
believers. But they will have no share of
Fay’* or war spoils, unless
they fight alongside the Muslims. If
they refuse to enter Islam, then
ask them to pay the Poll-tax. If
they do that, then accept it from
them and refrain from fighting
them. But if they refuse, then seek the
help of Allah against them
and fight them. If you lay siege to them
and they want you to give
them the protection of Allah and your
Prophet, do not give them the
protection of Allah and your Prophet,
rather give them your
protection and the protection of your father and
your Companions, for
if you violate your protection and the protection
of your fathers,
that is easier than violating the protection of Allah
and the
protection of His Messenger. If you lay siege to them and they
want
you to let them come out with a promise of the judgement of Allah
and
His Messenger (ﷺ), do not offer them a promise of the judgement
of
Allah and His Messenger (ﷺ), rather offer them your judgement,
because you do not know if you will actually pass (the same as)
Allah’s judgement regarding them or not.’”
Another chain reports a similar hadith. - Hadith Ibn Majah 2858 (islam)
Book 24, Hadith 106
Vol. 4, Book 24, Hadith 2858

Some Zanadiqa (atheists) were brought to `Ali and he burnt them. The news of this event, reached Ibn
`Abbas who said, "If I had been in his place, I would not have burnt them, as Allah's Messenger (ﷺ) forbade
it, saying, 'Do not punish anybody with Allah's punishment (fire).' I would have killed them according
to the statement of Allah's Messenger (ﷺ), 'Whoever changed his Islamic religion, then kill him.'" - Hadith Al Bukhari 6922 (islam)
Book 88, Hadith 5
Vol. 9, Book 84, Hadith 57

The Messenger of Allah (ﷺ) Said: The blood of a Muslim man who testifies that there is no god but Allah and that Muhammad is Allah's Apostle should not lawfully be shed except only for one of three reasons: a man who committed fornication after marriage, in which case he should be stoned; one who goes forth to fight with Allah and His Apostle, in which case he should be killed or crucified or exiled from the land; or one who commits murder for which he is killed.
- Hadith Abu Dawud 4353 (islam)
Book 40, Hadith 3
Book 39, Hadith 4339

[150]Indeed, those who disbelieve in Allah and His messengers and wish to discriminate between Allah and His messengers and say, "We believe in some and disbelieve in others," and wish to adopt a way in between -
[151]Those are the disbelievers, truly. And We have prepared for the disbelievers a humiliating punishment. - Quran An-Nisa(The Women) 4:150-151 (islam)

And whoever opposes the Messenger after guidance has become clear to him and follows other than the way of the believers - We will give him what he has taken and drive him into Hell, and evil it is as a destination. - Quran An-Nisa(The Women) 4:115 (islam)

The Prophet (ﷺ) said, "No doubt, I intended to order somebody to pronounce the Iqama of the
(compulsory congregational) prayer and then I would go to the houses of those who do not attend the
prayer and burn their houses over them." - Hadith Al Bukhari 2420 (islam)
Book 44, Hadith 10
Vol. 3, Book 41, Hadith 602

[6]Indeed, those who disbelieve - it is all the same for them whether you warn them or do not warn them - they will not believe.
[7]Allah has set a seal upon their hearts and upon their hearing, and over their vision is a veil. And for them is a great punishment. - Quran Al-Baqarah(The Cow) 2:6-7 (islam)