It is narrated from Sayyiduna Ali (may Allah be pleased with him) that once I said to Sayyidah Fatimah (may Allah be pleased with her) that marks have appeared on your hands from grinding flour; if you were to go to the Prophet (peace and blessings be upon him) and request a servant from him (perhaps things would become easier), she said, "You should come with me as well." So I went with her, and we presented our request before the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) said: "Shall I not tell you something that is better for you than a servant? When you lie down on your bed, say Subhan Allah thirty-three times, Alhamdulillah thirty-three times, and Allahu Akbar thirty-four times. In words, these are a hundred, but on the scale of deeds, they are equal to a thousand." So from that day onwards, I never abandoned them. A questioner asked, "Not even on the night of the Battle of Siffin?" He replied, "Yes! Not even on the night of the Battle of Siffin."
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 1250
Hadith Gradingحکم دارالسلام:حديث صحيح، و هذا إسناد حسن