A woman named Umm Khallad came to the Prophet ﷺ wearing a face veil, asking about her son who had been killed. One of the Prophet's companions said to her, "You have come asking about your son while wearing a face veil?"She replied, "If I have lost my son, I will not lose my modesty."The Messenger of Allah ﷺ said, "Your son has the reward of two martyrs."She asked, "Why is that, Messenger of Allah?"He answered, "Because he was killed by the People of the Book."
حدثنا عبد الرحمن بن سلام حدثنا حجاج بن محمد عن فرج بن فضالة
جاءت امرأة إلى النبي ﷺ يقال لها أم خلاد وهي منتقبة تسأل عن ابنها وهو مقتول فقال لها بعض أصحاب النبي ﷺ جئت تسألين عن ابنك وأنت منتقبة فقالت إن أرزأ ابني فلن أرزأ حيائي فقال رسول الله ﷺ ابنك له أجر شهيدين قالت ولم ذاك يا رسول الله قال لأنه قتله أهل الكتاب
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Its isnad is daif. Bayhaqi 9/175 narrated it from the hadith of Abu Dawud through the same chain. Faraj bin Fadala is daif. Abdul-Khabir is majhul al-hal (of unknown status). Thabit bin Qays is mastur (of concealed/unclear status).