It is narrated from Hazrat Abu Basrah Ghifari (may Allah be pleased with him) that one day the Prophet (peace and blessings be upon him) said: "Tomorrow I will ride and go to the Jews, therefore do not initiate greeting them with Salam, and when they greet you with Salam, you should only say «وعليكم»."
Hadith Referenceمسند احمد / من مسند القبائل / 27237
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد وهم فيه وكيع، فلم يذكر مرثدا بين يزيد و بين أبى بصرة