Offering congratulations for the beginning of Ramadan
Question

What is the ruling on offering congratulations for the beginning of Ramadan by saying “Kull ‘aam wa antum bikhayr (roughly equivalent to “Many happy returns” – traditional Arabic phrase of congratulations on occasions such as Eid etc.)?.
Praise be to Allah.There is no specific wording that the Muslim has to use to offer congratulations for the beginning of Ramadan, so it is permissible to offer congratulations in any wordings that are customary among the people, such as saying “Kull ‘aam wa antum bi khayr” and other words that do not contain any meanings that are forbidden in Islam. 
And Allah knows best.