From various chains of narration – in some of which the name of Sayyiduna Ibn Abbas (may Allah be pleased with them both) appears and in some it does not – it is narrated that after the first revelation descended, the Prophet (peace and blessings be upon him) said to Sayyidah Khadijah (may Allah be pleased with her): "I see a light and I hear a voice; I fear that something may happen to me (that I may become possessed)." Sayyidah Khadijah (may Allah be pleased with her) said: "O noble son of Abdullah! Allah will never do such a thing to you." Then she went to Waraqah bin Nawfal and mentioned this matter to him. He said: "If he is telling the truth, then the angel who comes to him is the same Namus (angel) who used to come to Musa (peace be upon him). If he is commissioned (as a Prophet) during my lifetime, I will support him, help him, and believe in him."
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 2845
Hadith Gradingحکم دارالسلام:إسناده صحيح، خ: 3، م : 190