Hadith: Whoever performs the Fajr prayer is under the protection of Allah

عن جُندب بن عبد الله القَسْرِِي رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم:
«مَنْ صَلَّى صَلَاةَ الصُّبْحِ فَهُوَ فِي ذِمَّةِ اللهِ، فَلَا يَطْلُبَنَّكُمُ اللهُ مِنْ ذِمَّتِهِ بِشَيْءٍ، فَإِنَّهُ مَنْ يَطْلُبْهُ مِنْ ذِمَّتِهِ بِشَيْءٍ يُدْرِكْهُ، ثُمَّ يَكُبَّهُ عَلَى وَجْهِهِ فِي نَارِ جَهَنَّمَ».
[صحيح] - [رواه مسلم] - [صحيح مسلم: 657]

Jundub ibn ‘Abdullāh al-Qasri (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said:
"Whoever performs the Fajr prayer is under the protection of Allah; so, do not infringe upon Allah's protection in any respect, for whoever infringes upon Allah's protection in any respect, He will seize him and throw him on his face in Hellfire."
[Authentic hadith] - [Narrated by Muslim] - [Sahih Muslim - 657]

Explanation

The Prophet (may Allah's peace and blessings be upon him) informs that whoever offers the Fajr prayer is preserved, guarded, and protected by Allah, defending and supporting him.
Then, he warns that whoever violates and revokes this covenant, either by failing to perform the Fajr prayer or by harming or attacking one who has performed it, has infringed upon this protection and is therefore worthy of the stern warning that Allah will seize him, due to his failure to observe Allah's right. He will throw him on his face in Hellfire.