Be inimical to an enemy of Ali even though he may be your father and your son

Imam Hasan Al-Askari (a.), from his father (a.), from his forefathers (a.) having said: „One day Messenger of God (s.) said to one of his (s.) companions: »O servant of God, Love for the Sake of God and hate for the Sake of God, and befriend for the Sake of God and be inimical for the Sake of God, for the Wilayah of God cannot be achieved except by that. And a man does not find the taste of Faith even if he is frequent in his Prayers, and his Fasting, until he becomes like that. Most of the brotherhood that takes place among the people today is for the sake of the world. They are being cordial for the sake of it and being hateful for its sake, and that they would not benefit anything from God.« So he said to him (s.): »And how can I know that I have befriended and been inimical for the Sake of God Mighty and Majestic, and who is a friend of God the High until I go and befriend him, and who is His enemy so that I can go and be inimical to him?« So, Messenger of God (s.) indicated towards Ali (a.) and said: »Do you see this one?« So he said: »Yes.« So he (s.) said: »A friend of his (a.) is a friend of God, so befriend him (a.). And an enemy of his (a.) is an enemy of God, so be inimical to him.« Then he (s.) said: »Befriend the friend of his (a.) even though he may have killed your father and your son, and be inimical to an enemy of his (a.) even though he may be your father and your son.«“ [Ilal-ush-Shara’i of Saduq, Volume 1, Chapter 119, Hadith 1]

حدثنا محمد بن القاسم الاسترابادي قال: حدثنا يوسف بن محمد بن زياد وعلي بن محمد بن يسار عن أبويهما عن الحسن بن على بن محمد بن موسى بن جعفر ابن محمد بن علي بن الحسين بن علي بن أبى طالب عن أبيه، عن آبائه عليهم السلام قال: قال رسول الله صلى الله عليه وآله لبعض أصحابه ذات يوم يا عبد الله احب في الله وابغض في الله ووال في الله وعاد في الله فإنه لا تنال ولاية الله إلا بذلك ولا يجد رجل طعم الايمان وان كثرت صلاته وصيامه حتى يكون كذلك وقد صارت مواخاة الناس يومكم هذا اكثرها في الدنيا، عليها يتواددون وعليها يتباغضون وذلك لا يغني عنهم من الله شيئا فقال له: وكيف لي ان اعلم انى قد واليت وعاديت في الله عز وجل ومن ولى الله تعالى حتى اواليه، ومن عدوه حتى أعاديه فاشارله رسول الله صلى الله عليه وآله إلى علي ” ع ” فقال أترى هذا فقال بلى فقال ولى هذا ولى الله فواله وعدو هذا عدوالله فعاده ثم قال: وال ولى هذا ولو انه قاتل أبيك وولدك وعاد عدو هذا ولو انه أبوك وولدك.