Allah'u'Abha! ... What does it mean?

In case you're wondering how to pronounce Allah'u'Abha, just listen to this song.

Referring to the song in the video below . . .

The first half of this video has two Arabic phrases. Ya Baha-ul-Abha means "Oh Thou Glory of Glories" and Ya Ali-ul-Allah means "O Thou Essence of God". The first phrase refers to Baha'u'llah - and when they sing that the video shows photos of sites associated with Him including the prison of 'Akka where He was incarcerated, and the beautiful mansion of Bahji which - when He moved into it was a grey monolith not even completed (it had been abandoned by the builder due to a cholera epidemic in the area) - but now it is well maintained by Baha'is and surrounded by amazing gardens.

When the phrase "Ya Ali-ul-Allah" is sung, the video cuts to views of and from the Shrine of the Bab on Mt. Carmel. The Bab (Gate) was the forerunner of Baha'u'llah... like John the Baptist was the forerunner of Jesus Christ. The Shrine of the Bab is actually His tomb. He was killed in Iran but His remains were lovingly hidden and preserved by His followers, the Babis, and eventually transported to the Holy Land and interred in the beautiful Shrine prepared for Him by Baha'is. The Bab was born with the name of Ali (Essence) so this phrase is meant to signify Him.