It is narrated from Sayyiduna Abu Malik al-Ash'ari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Your enemy is not the one who, if you kill him, it becomes light for you, and if he kills you, you enter Paradise. Rather, your greatest enemy is your child who came forth from your loins, and then your greatest enemy is your wealth which your right hand possesses."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3432