It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that he heard the Prophet (peace and blessings be upon him) say: After the period of cessation of revelation had passed, one day I was walking when I heard a voice from the sky. I looked up and saw, "the same angel who had come to me in the cave of Hira, sitting on a throne between the sky and the earth." Seeing this, I was overcome with intense trembling, and I went to Khadijah (may Allah be pleased with her) and said, "Cover me with a thick blanket." So she covered me with a blanket. On this occasion, Allah revealed this verse: «يَاأَيُّهَاالْمُدَّثِّرُ ٭ قُمْفَأَنذِرْ ٭» to the end. After that, the series of revelation began continuously.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 14483