Quran 9:6

وَإِنۡ أَحَدٌ۬ مِّنَ ٱلۡمُشۡرِكِينَ ٱسۡتَجَارَكَ فَأَجِرۡهُ حَتَّىٰ يَسۡمَعَ كَلَـٰمَ ٱللهِ ثُمَّ أَبۡلِغۡهُ مَأۡمَنَهُ ۥ‌ۚ ذَٲلِكَ بِأَنَّہُمۡ قَوۡمٌ۬ لَّا يَعۡلَمُونَ ٦

If one of the idol worshipers sought safe passage with you, you shall grant him safe passage, so that he can hear the word of ALLAH, then send him back to his place of security. That is because they are people who do not know.