However, if a Muslim says that to his Muslim brother from time to time, without thinking it to be an established Sunnah or binding, and without doing it on a regular basis, but just by way of supplication, then we hope that it is permissible; although leaving it is preferable so that it does not become like the established Sunnah.
Allaah Knows best.
Answered by Shaykh Saalih ibn Fowzaan al-Fowzaan
التهنئة بـ ((جمعة مباركة)) يوم الجمعة
الشيخ صالح بن فوزان الفوزان
ما حكم إرسال رسائل الجوال كل يوم جمعة وتختم بكلمة جمعة مباركة؟
ما كان السلف يهنئ بعضهم بعضًا يوم الجمعة؛ فلا نحدث شيئًا لم يفعلوه
More on this subject from other ‘Ulema:
Shaykh Fawzan was asked the following question:
Every Friday one of my colleagues sends me a text saying “Ju’muaah Mubaarak” and he continues saying that he hopes that I will add that to my cell phone greeting or to my greeting on the internet forums; what is your view of this?
This is an innovation, Allah has not sent down any authority for this action. This is an action that is not known or narrated in the Sunnah; it has not been narrated that the Muslims should congratulate each other on Friday; rather it has only been reported that they would congratulate each other on Eid Al Adha and Eid Al Fitr not on Friday. Therefore putting this is a text and encouraging others to do it is an innovation and from spreading innovation.
Shaykh Abdul Musin Al Abaad was asked the following question:
Based on the premise that Friday is a (Eid) holiday, is it permissible to greet each other saying, Ju’muaah Mubaarak or Ju’muaah Accepted?
By Allah, we don’t know of anything that proves the validity of this. As for the two Eids then it has been narrated that the companions when they would meet each other they would say, “May Allah accept it from us and you” or “May Allah accept your obedience”.
The Mufti Sheikh Abdul Aziz was asked the following question:
What is the ruling on the statement Ju’muaah Mubaarak?
There is no origin for sending out the greeting Ju’muaah Mubaarak on the cell phones. It is a bless day, no doubt. Allah the Exalted has singled us out with this day, and the Jews and Christians have been lead astray away from this day, but as for giving a greeting every Friday then we don’t know of any origin for this.