Wrap me up, wrap me up! So they wrapped me up, and the Blessed and Most Exalted Allah sent down:" You who are shrouded, arise and deliver warning, your Lord magnify, your clothes cleanse, and defilement shun," and" defilement" means idols; and then the revelation was followed continuously.
Sahih Muslim Book 1, Hadith 311
← Previous Hadith He (the Holy Prophet) came to Khadija an his heart was trembling. The rest of the hadith has been narrated like one transmitted by Yunus and Ma'mar, but the first part is not mentioned, i. e. the first thing with which was started the revelation to the Prophet was the true vision. And these words like those transmitted by Yunus are mentioned thus: By Allah, Allah would never humiliate you. And there is also a mention of the words of Khadija: O son of my uncle! Listen to the son of your brother.

Sahih Muslim Book 1, Hadith 310 Next Hadith → The wahi was intermitted for me for a small span of time and while I was walking, and then the hadith like the one narrated by Yunus was transmitted but with the exception of these words: I was terror-stricken till I fell on the ground. Abu Salama said: Defilement means idols. After this the revelation was speeded up and followed rapidly.

Sahih Muslim Book 1, Hadith 312