Short Dua for 1st Day of Ramzan al-Mubarak

Imam Ja'far ibn Muhammad al-Sadiq (A.S) said:

"Say not, This is Ramazan" and "Ramazan has departed" and "Ramazan has arrived" for surely, Ramazan is one of the names of Allah, The Mighty, the Glorious, who neither arrives nor departs. Surely, arrives and departs that, which is ephemeral, Instead say: "The month of Ramazan". "

Al-Kafi, 4, page 70]