Reference for Berakhot 69:13

מה להצד השוה שבהן שכן יש בו צד מזבח ואתי נמי זית דאית ביה צד מזבח

How is this the factor common to them both? [That they are both brought upon] the altar is likewise a common factor ! Then the olive must also be included because it likewise has this factor of [being brought to] the altar !

Jastrow