A clear shift in focus takes place as God introduces a new set of instructions, creating a thematic bridge between related topics. Previously, the laws established a strict standard of physical perfection for the priests who perform the sacred service, ensuring they are completely free from any physical defects. Now, the attention turns toward a parallel requirement for the animal sacrifices themselves.
The basic rule that an offering must be entirely whole and unblemished is not a new concept; it was introduced earlier when the general rules for sacrifices were first given. However, the current instructions revisit that requirement in order to provide a much deeper level of detail and precise definition [רש ר הירש]. Reflecting this distinct shift in topic, the traditional layout of the Torah marks this exact point as the formal beginning of a new, open section [מנחת שי].