Ben Bivai [concerning the interpretation of the verse in Rosh HaShanah 85a and Yoma (23a). And in the book Lechem Shamayim, it is stated that the first Bivai is written with a tzere and the second with a kamatz, and so it is in the book Ezra]:
Seder_HaDorot,_Tanaim_and_Amoraim.682:1