Let peoples serve you, and nations bow to you; be master over your brothers, and let your mother’s sons bow to you. Cursed be those who curse you, and blessed be those who bless you.
English: A non-Jew met Rabbi Yishmael and blessed him… [another cursed him]… He said to [his students], “And so it is written, ‘Those who curse you are cursed, and those who bless you are blessed.’”
On the daf / in context: The verse is treated as already effective: the blessing or curse directed at a Jew is answered by the Torah’s own declaration.
Type of Learning
Custom (Yerushalmi — the verse itself answers blessing and curse)
What Is Learned
When someone blesses or curses a Jew, the response is already written: “Those who curse you are cursed, and those who bless you are blessed.”