Masjid al-fajr is also know as Masjid Al-Musbih or Masjid Bani Unaif.
“Masjid Al-Musbih” meaning “The Morning Mosque” is said to be the place where The Prophetﷺ prayed his first Subh (Dawn) prayer when he first arrived at Quba, during his Hijrah to Madinah.
The Prophetﷺ visited Talha ibn al Bara’ in this area when he was sick & then after his death, returned to offer condolences & prayed for him.
Talha was a child who loved the Prophetﷺ dearly. Realizing he was about to die, he told his people not to call the Prophet, for it was night time & the area was full of Jews & he feared for the Prophet’s safety.
The Prophet was informed only in the morning. He came to the grave, stood the people in ranks, raised his hands, then said, “O Allah, meet Talha in such a manner that You smile at him & he smiles at You!”
This particular boy was known for his overwhelming devotion & attachment to the Prophetﷺ. He had once told him, “O Messenger of Allah, command me to do whatever you wish, for I shall not disobey any command of yours!”