Sayyidah Aisha (may Allah be pleased with her) says that the Messenger of Allah (peace and blessings be upon him) said: "Whoever introduces into our matter (religion) something which does not belong to it, it is rejected."
Hadith Referenceمسند الشهاب / 359
Hadith Gradingمحدثین:صحيح
Hadith Takhrij«صحيح ، وأخرجه البخاري : 2697، ومسلم : 1718، وأبو داود : 4606، وابن ماجه : 14 ، وأحمد فى «مسنده» برقم: 25088»