قرآن ﴿ إن الدين عند الله الاسلام وما إختلف الذين أوتوا الكتاب إلا من بعد ما جاءهم العلم بغياً بينهم ومن يكفر بآيات الله فإن الله سريع الحساب ﴾ آل عمران ١٩
والاسلام هو الدخول في السلم وهو الانقياد والطاعة يقال أسلم أي دخل في السلم وإستسلم
تفسير البغوي
{ Indeed religion in the sight of Allah is Islam, and those who have been given the book have not differed, except after knowledge came to them, out of aggression among themselves. And whoever disbelieves in the signs of Allah, indeed Allah is quick to reckon } Al ‘Imran 19
Islam means entering into a state of peace, which is compliance and obedience; it is said: “One has yielded into Islam”/“One has become a Muslim” [“aslama”], that is, he has entered into a state of peace and has surrendered.
Tafsir Al-Baghawi