What is the ruling on sending messages urging people to conclude the Hijri year with fasting or any act of worship, with the intention of turning a new page for the year with a righteous deed? What is the ruling on congratulating people on the new Hijri year? And what is the ruling on urging people to fast collectively or perform a specific night vigil when a calamity befalls Muslims, in order to unify supplication?

A Muslim should take heed of the passing days and years and be responsible for their life. Regarding the questions about this occasion, reminding people of good deeds and worship is permissible. However, dedicating a specific time for an act of worship without legitimate Sharia evidence is considered an innovative Bid'ah. Therefore, one must avoid dedicating the Hijri year to specific acts of worship. As for congratulating others on blessings that occur or calamities that are averted, this is among good customs, and the default ruling for it is permissibility. There is no harm in doing it or refraining from it, and if a Muslim is greeted with it, they should respond in kind.