He prays but he does not fast in Ramadan – does that make him a kaafir?

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Check below answers in case you are looking for other related questions:
The chaining up of the devils in Ramadaan
Some Sunnahs of fasting that the fasting person is encouraged to uphold

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He wants to start fasting on the fourth day
Suggested program for the Muslim during Ramadaan
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The chaining up of the devils in Ramadaan
Some Sunnahs of fasting that the fasting person is encouraged to uphold

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