It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Do abundantly the 'Baqiyat Salihat'." Someone asked, "O Messenger of Allah (peace and blessings be upon him)! What is meant by that?" The Prophet (peace and blessings be upon him) said, "Millat." Someone asked, "What is meant by that?" The Prophet (peace and blessings be upon him) said, "Millat." Upon being asked a third time, he said, "It means saying Takbeer, Tahleel, Tasbeeh, Tahmeed, and La hawla wa la quwwata illa billah."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11713
Hadith Gradingحکم دارالسلام:حسن لغيره، وهذا إسناد ضعيف كسابقه