The Báb, the founder of Bábism, and then Baháʼu'lláh, the founder of the Baháʼí Faith, adopted the day as a holy day and associated it with the Most Great Name of God.
Both the Báb, who established Bábism, and Baháʼu'lláh, who founded the Baháʼí Faith, considered this day sacred and linked it to God's Most Great Name.