It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Any Muslim who wakes up at night and says these words: 'La ilaha illallahu wallahu akbar, wal-hamdu lillah, wa subhanallahi rabbil-'alamin, Allahummaghfir li' (There is no god but Allah, Allah is the Greatest, all praise is for Allah, and glorified is Allah, the Lord of the worlds; O Allah, forgive me), he is forgiven. Then if he resolves firmly, gets up, performs ablution and then supplicates to Allah, Allah answers his supplication."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-Mut'im bin al-Miqdam except Yazid bin Yusuf, and Mansur bin Abi Muzahim is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب العين / 4210
Hadith Gradingمحدثین:إسناده ضعيف جدًّا، فيه أبان بن أبي عياش متروك
Hadith Takhrij«قال الهيثمي: وفيه أبان بن أبي عياش وهو متروك «مجمع الزوائد ومنبع الفوائد، ج 10، ص 126»» «أخرجه الطيالسي فى «مسنده» برقم: 2588»