The beginning of the due time of Salah is a condition for it to be obligated and valid
Q 3: In our Masjid (mosque),
people offer Fajr (Dawn) Prayer half an hour before dawn.
Should we offer Salah (Prayer) with the congregation before its prescribed time or offer it at its due time in our houses?
The beginning of the prescribed time of Prayer is a condition that makes the Five Obligatory Daily Prayers obligatory and valid. This is a legal ruling and a well-established religious matter. If a person offers Salah before its due time, it is invalid and should be repeated in its due time. If what you have mentioned is true, you should advise those who are in charge of the Masjid.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.