It is narrated from Sayyiduna Abu al-Darda' (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Any servant who says 'La ilaha illallah wallahu akbar' (There is no god but Allah, and Allah is the Greatest), Allah Almighty frees a quarter of his body from the Fire. If he says it twice, Allah frees half of him from the Fire. If he says it three times, Allah frees three quarters of him from the Fire, and if he says it four times, Allah frees him entirely from the Fire."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyiduna Abu al-Darda' (may Allah be pleased with him) only with this chain; Abu Bakr bin Abi Maryam is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 8941
Hadith Gradingمحدثین:إسناده ضعيف لضعف أبي بكر بن أبي مريم
Hadith Takhrij«قال الهيثمي: فيهما أبو بكر بن أبي مريم وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 10، ص 87»»