He is mentally ill and does not pray or fast; what is the ruling?

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Check below answers in case you are looking for other related questions:
His faith grew weak after he had become righteous and he stopped praying for a few days
Sometimes he feels too lazy to pray – what is the remedy?

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Related Answers:
She is asking about the ruling on her husband who went to practitioners of magic and stopped praying
He used to masturbate and pray without doing ghusl – does he have to make up those prayers?
How can a person still be Muslim if he reaches the point of being executed and still insists on not praying?
His faith grew weak after he had become righteous and he stopped praying for a few days
Sometimes he feels too lazy to pray – what is the remedy?

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