Rashi on Leviticus 24:9/רש"י על ויקרא כ״ד:ט׳

1והיתה AND IT SHALL BE — this meal-offering shall be — [AARON’S AND HIS SONS’]; (although the word מנחה is not mentioned in the text it is implicitly contained in the word לחם) because anything that is brought (offered) of grain comes under the term of ‎מנחה.

2ואכלהו‎ AND THEY SHALL EAT IT; the suffix which is masc. refers to לחם which is masculine.