The “first” events that took place in Baghdad while Bahá’u’lláh was there

And finally, before the gaze of the diversified communities that dwelt within its gates,

• the first phase in the gradual unfoldment of a newborn Revelation was ushered in,
• the first effusions from the inspired pen of its Author were recorded,
• the first principles of His slowly crystallizing doctrine were formulated,
• the first implications of His august station were apprehended,
• the first attacks aiming at the disruption of His Faith from within were launched,
• the first victories over its internal enemies were registered, and
• the first pilgrimages to the Door of His Presence were undertaken.

- Shoghi Effendi  (‘God Passes By’, chapter 7)