ויחד יתרו על כל הטובה אשר עשה ד' לישראל
Rashi translates va’yichad Yisro as va’yismach Yisro, as rejoicing over the salvation of Am Yisrael. The Brisker Rav, zl (cited by Horav Eliyahu Baruch Finkel, zl) explains Yisro’s b’rachah as a blessing of gomeil, gratitude to Hashem. We would normally think that the person who recites the blessing is none other than the direct beneficiary of Hashem’s favor. The Shulchan Aruch (Orach Chaim 219:4), however, rules that one can fulfill his obligation to bless through the medium of his fellow’s blessing. This means that “Reuven” can bentch gomeil for “Shimon,” and Shimon will have properly discharged his religious duty to…
