The Third Temple (Hebrew: בית המקדש השלישי, Beit haMikdash haShlishi, literally: The House, the Holy, the Third) would be the third Jewish Temple in Jerusalem, after Solomon's Temple and the rebuilt Second Temple.
Although it remains unbuilt, the notion of and desire for a Third Temple is sacred in Judaism, particularly Orthodox Judaism, and anticipated as a place of worship. The prophets in the Hebrew Bible called for its construction to be fulfilled prior to, or in tandem with, the Messianic Age. The rebuilding of the Third Temple also plays a major role in some interpretations of Christian eschatology.
Shoghi Effendi, the head of the Baháʼí F
Shoghi Effendi, the head of the Baháʼí Faith in the first half of the 20th century, explained that this verse refers to the prophecy in the Hebrew Bible where Zechariah had promised the rebuilding of the Temple in the End Times as fulfilled in the return of the Manifestation of God, Bahá'u'lláh, in a human temple. Throughout the tablet, Bahá'u'lláh addresses the Temple (himself) and explains the glory which is invested in it allowing all the nations of the world to find redemption. In the tablet, Bahá'u'lláh states that the Manifestation of God is a pure mirror that reflects the sovereignty of God and manifests God's beauty and grandeur to mankind. In essence, Bahá'u'lláh explains that the Manifestation of God is a "Living Temple" and Bahá'u'lláh addresses the organs and limbs of the human body and bids each to focus on God and not the earthly world.