Silsilat al-Ahadith al-Sahihah

The Messenger of Allah (peace and blessings be upon him) said: "Whoever I am a friend to, Ali is also his friend. O Allah! Be the friend of whoever befriends Ali, and be the enemy of whoever bears enmity towards him." This hadith is narrated from Sayyiduna Zaid bin Arqam, Sayyiduna Sa'd bin Abi Waqqas, Sayyiduna Buraydah bin Husayb, Sayyiduna Ali bin Abi Talib, Sayyiduna Abu Ayyub Ansari, Sayyiduna Bara bin Azib, Sayyiduna Abdullah bin Abbas, Sayyiduna Anas bin Malik, Sayyiduna Abu Sa'id Khudri, and Sayyiduna Abu Hurairah (may Allah be pleased with them all).