Verses with the word debate in the Old Testament (3 verses):

Proverbs 25:9
Debate thy cause with thy neighbour himself; and discover not a secret to another:

Isaiah 27:8
In measure, when it shooteth forth, thou wilt debate with it: he stayeth his rough wind in the day of the east wind.

Isaiah 58:4
Behold, ye fast for strife and debate, and to smite with the fist of wickedness: ye shall not fast as ye do this day, to make your voice to be heard on high.