The love of the father of Rav Ada. [See the Midrash HaNe'elam, Parashat Tetzaveh, regarding how Rabbi Yossi ben Ozi recounted his birth and wisdom when he was seven years old, and Rabbi Alexandri was his teacher, and he saw his son Rav Ada (see Nishmat Chaim, Ma'amar 2, Chapter 2)]:
Seder_HaDorot,_Tanaim_and_Amoraim.251:1