Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrated: The Prophet (peace and blessings be upon him) said: "When one of you attacks a (non-Muslim) man with a spear, and the point of the spear is at his (the non-Muslim's) throat, and at that moment he says La ilaha illallah (there is no god but Allah), then the Muslim should lift the spear away from him."
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir and al-Mu'jam al-Awsat. Its chain contains a narrator, al-Salt bin Abd al-Rahman al-Zubaydi, who cannot be relied upon as evidence.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الإيمان / 50
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«اخرجه الامام الطبراني فى معجمه الكبير 10292 اخرجه الامام الطبراني فى معجمه الاوسط 69 ، أخرجه المعجم الكبير للطبراني برقم: 10292، وأخرجه المعجم الأوسط للطبراني برقم: 69»