Quran 9:4

إِلَّا ٱلَّذِينَ عَـٰهَدتُّم مِّنَ ٱلۡمُشۡرِكِينَ ثُمَّ لَمۡ يَنقُصُوكُمۡ شَيۡـًٔ۬ا وَلَمۡ يُظَـٰهِرُواْ عَلَيۡكُمۡ أَحَدً۬ا فَأَتِمُّوٓاْ إِلَيۡهِمۡ عَهۡدَهُمۡ إِلَىٰ مُدَّتِہِمۡ‌ۚ إِنَّ ٱللَّهَ يُحِبُّ ٱلۡمُتَّقِينَ ٤

If the idol worshipers sign a peace treaty with you, and do not violate it, nor band together with others against you, you shall fulfil your treaty with them until the expiration date. ALLAH loves the righteous.