Imam Ja'far as-Sadiq (alayhi salam) 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, vol. 4, pg. 70 -