From Sahih Bukhari (Hadith 4963):
Narrated Abu Huraira:The Prophet (ﷺ) was asked about donkeys and he replied, "Nothing has been revealed to me regarding donkeys except this comprehensive Verse which includes everything: "So whoever does good equal to the weight of an atom (or a smallest ant) shall see it; And whoever, does evil equal to the weight of an atom or a smallest ant) shall see it
Reference: Bukhari 4963