פירוש על ויקרא 23:12

ועשיתם... כבש AND YE SHALL OFFER… A LAMB — This came (was brought) as an obligatory sacrifice in connection with the Omer.

An obligation in connection with the omer. Rashi is answering the question: Why in parshas Pinchas (Bamidbar 28,) which lists [all] the additional offerings [of Pesach], as Rashi explains (in verse 8), is there no mention of this sheep? He answers: This sheep is not brought as an additional offering but comes as an obligation in connection related towith the omer.