It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever says in the morning: 'Allahumma inni asbahtu ushhiduka, wa ushhidu hamalata 'arshika wa mala'ikataka, wa jami'a khalqika, bi-annaka antallahu la ilaha illa anta, wahdaka la sharika laka, wa anna Muhammadan 'abduka wa rasuluka' (O Allah, I have entered the morning in this state that I call You to witness, and I call the bearers of Your Throne, Your angels and all Your creation to witness, that truly You are Allah, there is no god (worthy of worship) except You, You are One, You have no partner, and that Muhammad (peace and blessings be upon him) is Your servant and Your Messenger), Allah Almighty forgives him the sins he commits on that day; and if he says these words in the evening, Allah Almighty forgives him the sins he commits during that night."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyiduna Anas (may Allah be pleased with him) only with this chain, and Baqiyyah (may Allah have mercy on him) is alone in transmitting it."
Hadith Referenceالمعجم الأوسط / باب الميم / 7205
Hadith Gradingمحدثین:فيه بقية بن الوليد وهو مدلس
Hadith Takhrij«قال الهيثمي: وفيه بقية بن الوليد وهو مدلس «مجمع الزوائد ومنبع الفوائد، ج 10، ص 119»» «قال الترمذي: حسنه «فتح الباري شرح صحيح البخاري، ج 11، ص 134»» «أخرجه الضياء المقدسي فى «الأحاديث المختارة» برقم: 2649، 2650، 2664، 2665، والنسائي فى «السنن الكبرى» برقم: 9753، 9754، وأبو داود فى «سننه» برقم: 5069، 5078، والترمذي فى «جامعه» برقم: 3501»