2. A poem by Li Bai, a poet in the Tang Dynasty, "Wash the inkstone several times, and the sesame residue wets the paper". This poem describes that when Li Bai altered Qu Yuan's Li Sao, he accidentally spilled ink residue. This is just a trivial matter as big as sesame seeds, just like a small dirty spot on paper, so don't worry about it. Later, the word "sesame" in idioms was extended to trivial matters.
3, from the novel "The Scholars", in which there is a cloud: "Why are you suspicious when sesame seeds are big?" In this sentence, sesame is also used as a metaphor for small things to persuade people not to enlarge their consideration. The source of this version is more accurate and direct.