Day of the Covenant is a Bahá'í holy day that commemorates Bahá'u'lláh's appointment of his eldest son, `Abdu'l-Bahá, as the authorized interpreter of his teachings and the Center of the Covenant after his passing. Bahá'ís view this covenant as central to preserving the unity of their faith, ensuring a clear and unbroken line of guidance rather than the fragmentation seen after the passing of leaders in some other religious traditions. The day is generally observed with joyful gatherings, prayers, and reflections on the importance of unity.