English: “And he shall lean his hand” — and not the hand of his slave, and not the hand of his agent, and not the hand of his wife.
In the sugya: “His hand” is exclusive. Ordinary shelichut does not transfer semicha. The owner must lean with his own hand; slave, agent, and wife are listed as classic failed substitutes.
Type of Learning
Miyut from “his hand” — no shelichut for semicha.
What Is Learned
Semicha must be done by the owner’s own hand. Agency and substitution do not work for this act. “His hand” blocks the hand of his slave, his agent, and his wife as stand-ins.