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.
The Báb, the founder of Bábism, and subsequently Baháʼu'lláh, the founder of the Baháʼí Faith, made it a holy day and linked it to God's Most Great Name.