Moshe spoke to the heads of the tribes of the Children of Israel…if a man shall make an oath unto God. Why did this portion begin as a directive to the tribal heads? The rule is that if a person makes a religious oath and later regrets it, he may go to a wise and learned person who will find a way to undo the oath. He does this by finding an “opening” which suggests that if the person had properly understood the ramifications of their words, they would never had uttered their oath. Leaders are supposed to understand the full ramifications of their own statements, therefore they are uniquely prepared to undo the oaths of others and this explains why this portion is addressed to them.