From Sahih Bukhari (Hadith 1125):
Narrated Jundab bin `Abdullah:Gabriel did not come to the Prophet (for some time) and so one of the Quraish women said, "His Satan has deserted him." So came the Divine Revelation: "By the forenoon And by the night When it is still! Your Lord (O Muhammad) has neither Forsaken you Nor hated you
Reference: Bukhari 1125