Yisro’s grand realization[1]
וישמע יתרו כהן מדין חתן משה את כל אשר עשה אלקים למשה ולישראל עמו כי הוציא יקוק את ישראל ממצרים
Yisro, the priest of Midian, the father in-law of Moshe, heard all that G-d did for Moshe and for His nation of Yisroel, since Hashem took Yisroel out of Egypt[2]
As the Jews traveled towards Mount Sinai for the giving of the Torah[3], Moshe’s father in-law Yisro made a grand appearance. The Torah tells us that he heard what had happened to the Jews, and decided to join them and convert to their religion. The verse doesn’t specify what Yisro heard which inspired him to convert, but the Midrash elaborates[4]. One opinion says that Yisro heard about the splitting of the sea. In fact, the entire world heard about this amazing miracle. According to this opinion, only Yisro took the miracle as a call to action to join the Jewish people. Another opinion says that Yisro heard about the war with Amalek. Right after the Exodus, the Jews were ambushed by this nation which represents pure evil. It was this war that inspired Yisro to convert to the Jewish religion[5].