What is the authenticity of the hadith: “Whoever prays Fajr in the mosque”

Question:
What is the grade of the hadith: “Whoever prays Fajr in the mosque and remains there until the sun rises to the height of a spear, he has the reward of a Hajj and an Umrah,” or as it was said?

Answer:
This was reported from the Prophet (peace and blessings be upon him), but as far as I recall, there is a concern in its chain of narration, and it is not one of those well-known for being authentic. I have tasked some of our students a long time ago to collect its various routes and trace it in its sources, and until now this has not been completed. Perhaps I will undertake this myself, and this will be, if Allah wills, in the other Friday session.
As for what is established and preserved, it is that he (peace and blessings be upon him), when he prayed Fajr, would sit in his prayer place until the sun rose with a good rise. If he prayed, he would supplicate to Allah and remember Allah . This is established from him, the one upon whom are prayers and peace.
It is also established from the hadith of 'Amr ibn 'Ubaydah the prohibition of prayer after Fajr until the sun rises. Once it has risen, pray, for the prayer is witnessed and observed. This indicates that it is prescribed to pray after the sun rises and after it has risen inside the mosque. It is prescribed for him to pray before leaving after the sun has risen. Likewise, in his home, the Duha prayer. And if the prayer is after the sun has risen, after the intensity of the mid-morning, it is better. For the prayer of the returning ones is when the mid-morning becomes intense, when the young camels are scorched by the heat, when the mid-morning becomes intense in the day.