Is the obligation of Havdalah from the Torah (d'oraita) or rabbinic (d'rabbanan)?

Synopsis

The Rambam holds Havdalah is a Torah obligation derived from 'zachor,' while others hold it is rabbinic with a biblical support (asmachta). All agree that once Havdalah is said in prayer, the cup obligation is rabbinic.

Rishonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

Discussion

Discussion coming soon.

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