Ibn Abi Umayr narrated from Ishaq ibn Ammar, who said that Abu Abdullah Imam Jafar ibn Muhammad Al-Sadiq عليه السلام, peace be upon him, said: "O' Ishaq, be courteous to the hypocrite with your speech, but keep your sincere affection for the believer. And if a Jew sits with you, then treat him with good companionship."