It is narrated from Sayyiduna Ali (may Allah be pleased with him) that he said: I bear witness that the Prophet (peace and blessings be upon him) made a peace treaty with the Christians of Banu Taghlib on the condition that "they would not make their children Christians, and if they did so, the covenant of protection (dhimmah) with them would come to an end." Then Sayyiduna Ali (may Allah be pleased with him) said: "By Allah, they have done it (violated the covenant)! So by Allah, if my authority becomes fully established, I will certainly kill their fighting men and take their offspring captive."
Hadith Referenceمسند أبي يعلى الموصلي / مسند علي بن أبي طالب رضي الله عنه / 332
Hadith Gradingمحدثین:إسناده ضعيف جدا
Hadith Takhrij«حکم الحدیث مسند ابی یعلی محققاً تنسیق حسين سليم أسد - مکتبہ شاملہ :قال حسين سليم أسد: إسناده ضعيف جدا . » «قال سعيد بن محمد السناري: منكر: مضى سابقًا [برقم/ 323]» «أخرجه عبد الرزاق فى (مصنفه) برقم: 9975، 19393، مسند ابویعلیٰ ترقیم الاثری: 327»