Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) narrates: Whenever the Prophet (peace and blessings be upon him) dispatched a military expedition, he would say: "Seeking blessing with the name of Allah Almighty, take part in the battle, and fight those who disbelieve in Allah Almighty. Do not mutilate, do not embezzle, do not break covenants, and do not kill any child or aged old man."
Al-Bazzar recorded it, and al-Tabarani in al-Mu'jam al-Saghir and al-Mu'jam al-Kabir. The narrators of al-Bazzar are the narrators of the Sahih, except for Uthman bin Sa'id al-Murri; his case is different, and he is thiqah (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجهاد / 9614
Hadith Gradingمحدثین:إسنادہ صحیح
Hadith Takhrij«اخرجه الطبراني فى المعجم الصغير (514) أخرجه البزار فى المسند (1674) ، أخرجه مسند البزار برقم: 3122»