It was 8th of Rabee-ul-Awwal in the 13th year of Inauguration of Prophet hood (First year of Hijri as the starting point for Islaamic Lunar calendar the day being Monday (23rd of September, 622 A.D.), that the Holy Prophet arrived at the place known as QABBA near Madina. Here the first Mosque in Islaam was built. Allah says:

"This is the Masjid (mosque) which has its foundations from the first day on piety (and sincerity). It has therefore the greatest sancity —" (Al-Quraan - IX: 108)."

As soon as people of Medina heard that the Holy Prophet (blessings and salutations of Allah on him), crowds came flocking out of Medina. They started to come every morning and wait eagerly for his appearance until noon. It was morning when the Holy Prophet (blessings and salutations on him) appeared at this place. All the Muslims greeted him with shouts of Allaho Akbar (Allah is the greatest); and they gathered around him like moths. Those who had not uptil now seen the Holy Prophet (blessings and salutations of Allah on him), had taken Hadhrat Aboo Bakr as the Holy Prophet Salallaho Alaihi Wasallam Hadhrat Aboo Bakr (Allah is pleased with him) understood the situation. He took a sheet of cloth, stood up, and shadowed over the head of the Holy Prophet (blessings and salutations of Allah on him) with this; from which every one realised that he was Aboo Bakr Siddique (Allah is pleased with him). The Holy Prophet (blessings and salutations of Allah on him) stayed here upto Thursday. During three days the first thing which the Holy Prophet (blessings and salutations of Allah on him) did was to lay the foundations of the first Masjid in Islaam which is the profoundest mosque as stated by the Holy Quraan (Sura IX : 108). Mosques are for the worship of one Allah worth worship Who has no partner or associate or equal.