It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) (according to what the narrator Hammad thought) that the Prophet (peace and blessings be upon him) said to Sayyidah Khadijah (may Allah be pleased with her): "I hear a voice and see a light, and I fear that I may have been touched by madness." Sayyidah Khadijah (may Allah be pleased with her) said: Allah would never do that to you, O son of Abdullah! Then she went to Waraqah bin Nawfal and told him about this. He said: If this is true, then this is a Namus (the angel) like the Namus of Musa (peace be upon him). If he is sent as a prophet while I am alive, I will strengthen him, support him and help him.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19332