Chabad.org — English translation + Rashi
Torah Temimah points to Zevachim 2a.
E-Daf.com — Zevachim 2a
HebrewBooks / Shas PDF
English: Three times “his offering” is written here — and all of them concern semichah.
Multiple “korbono” for semichah teaching — the three occurrences of “his offering” in the shelamim section each elaborate an aspect of the semichah requirement.
The three occurrences of “his offering” in the shelamim section are each linked to aspects of the semichah requirement. The Gemara reads the repetitions as deliberate, so that each instance can teach a distinct detail of the law of laying hands. This yields a cluster of rulings that together define when and how the owner must lean upon the animal before its slaughter.