TT #20 · Parshas Shemini · Aliyah 2 · Passuk 17
Chabad.org — English translation + Rashi
Menachos 9b.
E-Daf.com — Menachos 9b (Tsurras Hadaf)
English: “He filled his hand.” I do not know whether this means the right hand or the left. When the Torah later says of the oil, “the priest shall take ... and pour it upon the priest’s left hand,” we learn that here it is the left; therefore, wherever Scripture says simply “hand,” it means the right.
Textual comparison — an explicit reference to the priest’s left hand elsewhere determines which hand is meant here, while the unqualified term “hand” ordinarily denotes the right hand.
The כַּף used for filling the priest’s hand here is the left hand, established from the explicit left-hand description in the comparable passage. Where the Torah says only כַּף without qualification, the default is the right hand.