Strange coincidence: I recognized this illustration of Guan Yu immediately, it is a mirror image of the one in this picture I took at Quan ji tang 勸濟堂 temple in Jinguashi 金瓜石, Taiwan a few years ago https://twitter.com/edwardW2/status/1385133111743172610

It depicts Guan Yu reading the Spring and Autumn Annals, a common motif that is also the basis of the temple's most famous feature, this gigantic gold statue of Guan Yu

A comment from Guan Yu's biography in the "Record of the Three Kingdoms" 三國志 mentions that he was fond of reading the Zuo commentary on the "Spring and Autumn Annals" 左傳.

The text on the first image describes a scene in which Cao Cao is attempting to lure Guan Yu to join him by sending beautiful women to seduce him, and instead Guan Yu simply concentrates on reading the Spring and Autumn annals.

But as far as I know this scene doesn't appear in either 三國志 or the novel Romance of the Three Kingdoms 三國演義. (The novel describes Cao Cao's temptation of Guan Yu, but the book isn't mentioned)

There are many other depictions of this scene, you can find a lot of them by searching 夜讀春秋. I'm not sure what the original version of this particular image is, but the connection between the book's illustration and the one at the temple is very clear!

I took the picture because of the anachronistic depiction of Guan Yu reading a string-bound book, which were not invented until the 9th century and were not become common until the 16th century.

But it makes sense when you consider that Three Kingdoms imagery often owes more to the era in which the novel was written, as opposed to the 3rd century historical period