Reference: Fataawa Ramadhaan – Volume 2, Page 741, Fatwa No.750
al-Muntaqaa min Fataawa Shaykh Saalih Ibn Fowzaan – Volume 3, Page 123
Question: Upon the arrival of the month of Ramadhaan, we hear many people congratulating one another on its arrival by saying: “Congratulations to you on [the arrival of] the month of Ramadhaan”. So is there any legal basis for this? Provide us with a fatwa, and may you be rewarded.
Response: There is no harm in extending greetings on the arrival of the month of Ramadhaan, because the Prophet ﷺ would give glad tidings to his Companions on the arrival of the month of Ramadhaan, and he would encourage them to exert themselves with noble actions [during this month]. And Allaah (Subhaanahu wa Ta’aala) says:
So extending greetings for this month and [showing] happiness at its arrival is indicative of the desire for that which is good. And the Pious Predecessors would give glad tidings to one another on the arrival of the month of Ramadhaan – following the example of the Prophet ﷺ as occurs in the long hadeeth of Salmaan in which the Prophet ﷺ said:
…and so on til the end of the hadeeth.