A number of our people have narrated from Ahmad ibn Muhammad from Ahmad ibn Muhammad ibn Abu Nasr from Hisham ibn Salim from Saad who has said the following: Once, we eight people were in the presence of Imam Abu Jafar (as). We spoke of Ramadhan.
Imam (as) said: You must not say, This is Ramadhan or Ramadhan is gone or Ramadhan has come. Ramadhan is one of the names of Allah, the Mighty & the Majestic, which does not come or go. What comes or goes is what is not durable. You instead should say, The Month of Ramadhan. The word Month in this case is used in a possessive case in relation to the noun, the name, the name that is the name of Allah, the the Mighty & the Majestic. This month is the one when the Holy Quran was revealed, and He has made it a festival and an example.
[al Kafi, Volume no. 4]
Divine Treasure 