In إِنْ أَتَيْتَنِي وَاللَّهِ لَآتِيَنَّكَ, the oath in the middle is treated as effective; the lām and emphatic nūn mark the oath response.
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Middle Oath: Answer to the Oath
Conditional Particles: In, Law and Ammā
In إِنْ أَتَيْتَنِي وَاللَّهِ لَآتِيَنَّكَ, the oath in the middle is treated as effective; the lām and emphatic nūn mark the oath response.