Rabin brought the Torah of Rabbi Yochanan in Israel to Babylonia to establish the difference between a false oath, not keeping one's word, and swearing in vain (with 3 different verses in the Torah that establish the prohibition). Plus, every negative commandment that has an action - gets lashes. But if there's no action, no lashes -- except for the exceptions, where lashes would be incurred. Also, establishing the views of the sages with regard to the unspecified statements - and what they mean in terms of amounts, and so on. For example: if a minute amount of food is prohibited, does it incur a sacrifice? In part, it's contingent on establishing the definitions - what is the minimum amount for eating to count as eating?