Ayesha reported,

The first form of revelation that came to the Messenger of Allah ﷺ was true dreams during sleep. The account continues, "The Prophet ﷺ returned to Khadijah with his heart pounding, and she took him to Waraqah bin Nawfal, who was a man who had embraced Christianity and used to read the Gospel in Arabic."Waraqah asked, "What do you see?"The Prophet ﷺ told him what had happened.Waraqah said, "This is the same Namus that Allah sent down to Musa. If I live to see your day, I will support you with mighty support."

عن عائشة قالت

كان أول ما بدئ به رسول الله ﷺ من الوحي الرؤيا الصادقة في النوم وفيه: فرجع النبي ﷺ إلى خديجة يرجف فؤاده فانطلقت به إلى ورقة بن نوفل وكان رجلا تنصر يقرأ الإنجيل بالعربية فقال ورقة: ماذا ترى؟ فأخبره فقال ورقة: هذا الناموس الذي أنزل الله على موسى، وإن أدركني يومك أنصرك نصرا مؤزرا.