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The above two interpolations are based on Zamakhshari's commentary on this verse. The oath "As thou livest" reads, literally, "By thy life".
This is the only time in the Quran where Allah swears by the life of a human being. Elsewhere Allah swears by the sun, the moon, the stars, and other marvels of His creation.
The wild, mad fury of passion and sin attains its own destruction and cuts off the last hope of repentance or mercy.