If the worshipper gets up for a fifth rak‘ah in a four-rak‘ah prayer, what should he do?

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By mistake he said when bowing, “Subhaana rabbiy al-a‘la”
If he notices the whisper of the Shaytaan during the congregational prayer, how should he spit dryly to his left?

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Related Answers:
He forgot the final tashahhud and said the salaam
Should a latecomer count an extra rak’ah done with the imam?
Not doing sujood al-sahw in order to ward off waswaas (insinuating whispers from the Shaytaan)
By mistake he said when bowing, “Subhaana rabbiy al-a‘la”
If he notices the whisper of the Shaytaan during the congregational prayer, how should he spit dryly to his left?

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