If Qunut is forgotten and the worshipper remembers after reaching Ruku:
• do not return to the original Qunut position;
• do not recite Qunut in Ruku;
• if Qunut is recited after rising from Ruku, the Ruku is not repeated;
• Sujud al-Sahw is performed because Qunut was displaced from its proper place.
The key rule is: once Ruku has been reached, do not reverse the prayer simply to restore Qunut to its original position.
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Witr: Structure, Qunut, Missed Qunut, and Ramadan Congregation
If Qunut is forgotten and the worshipper remembers after reaching Ruku:
• do not return to the original Qunut position;
• do not recite Qunut in Ruku;
• if Qunut is recited after rising from Ruku, the Ruku is not repeated;
• Sujud al-Sahw is performed because Qunut was displaced from its proper place.
The key rule is: once Ruku has been reached, do not reverse the prayer simply to restore Qunut to its original position.