It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) came out to us while a man was giving an exhortation, and the man fell silent. The Prophet (peace and blessings be upon him) said: "Carry on. That I should sit in this place from the time I pray the Fajr prayer until the sun rises is dearer to me than freeing four slaves, and that I should sit from the time I pray until the sun sets is also dearer to me than freeing four slaves."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7982