Whoever says "there is no god but Allah, and Allah is Greatest," his Lord affirms it, saying: There is no god but Me, and I am Greatest
عن أبي سعيد الخدري وأبي هريرة رضي الله عنهما أَنهُما شَهِدَا عَلَى رسول اللَّه -صَلّى اللهُ عَلَيْهِ وسَلَّم- أَنه قالَ: «من قال: لا إله إلا الله والله أكبر، صَدَّقه ربه، فقال: لا إله إلا أنا وأنا أكبر. وإذا قال: لا إله إلا الله وحده لا شريك له، قال: يقول: لا إله إلا أنا وَحدِي لا شريك لي. وإذا قال: لا إله إلا الله له الملك وله الحمد، قال: لا إله إلا أنا لي الملك ولي الحمد. وإذا قال: لا إله إلا الله ولا حول ولا قوة إلا بالله، قال: لا إله إلا أنا ولا حول ولا قوة إلا بي» وكان يقول: «من قالها في مرضه ثم مات لم تَطْعَمْهُ النار».
Explanation
Abu Hurayrah and Abu Sa‘īd al-Khudri (may Allah be pleased with both of them) reported that the Prophet (may Allah's peace and blessings be upon him) said that Allah affirms what His slave says. If one says, "there is no god but Allah, and Allah is Greatest," Allah says: "Indeed, there is no god but Me, and I am Greatest." When one says, "Allah is Greatest, and there is no might nor power save with Allah," Allah would affirm it.
So, if a person said this Dhikr (There is no god but Allah, and there is no might nor power save with Allah) then died, the Fire would not consume him, i.e. that would be a reason not to be burnt in Hellfire. Therefore, every Muslim should memorize this Dhikr and say it when he is ill, so that Allah would grant him a good end for his life, Allah, the Almighty, Willing.
Source
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