Under the rod — Either, The tither's rod, it being the manner of the Jews in tithing to cause all their cattle to pass through some gate or narrow passage, where the tenth was marked by a person appointed for that purpose and reserved for the priest. Or, the shepherd's rod, under which the herds and flocks passed, and by which they were governed and numbered. See Jeremiah 33:13; Ezekiel 20:37.
Related Commentaries of Leviticus 27:32
Leviticus 27:32
32 And concerning the tithe of the herd, or of the flock, even of whatsoever passeth under the rod, the tenth shall be holy unto the LORD.