It is narrated from Sayyiduna al-Hasan bin Ali (may Allah be pleased with them both) that he said: I heard my maternal grandfather, the Messenger of Allah (peace and blessings be upon him), say: "Whoever offers the Fajr prayer and then sits remembering Allah until the sun rises, this deed will become a barrier (screen) for him from Hell."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Muhammad bin Juhadah except al-Hasan bin Abi Ja'far, and al-Mundhir is alone in narrating it from his father."
Hadith Referenceالمعجم الأوسط / باب الياء / 9483
Hadith Takhrij«أخرجه الترمذي فى «جامعه» برقم: 801، وأبو يعلى فى «مسنده» برقم: 6763، والبزار فى «مسنده» برقم: 1335، وابن حجر فى «المطالب العالية» برقم: 543، 645، وابن أبي شيبة فى «مصنفه» برقم: 7852، والطبراني فى «الكبير» برقم: 2751، والطبراني فى «الصغير» برقم: 1138»