God does not hold you responsible for “unintentional” oaths [such as swearing that you will not eat such and such lawful food, not sleep anymore with your wives, etc.] The Lord, however, will hold you responsible for your “intentional” oaths [such as swearing by God that you will do such and such thing for such and such person.] If you break a solemn oath, you have to feed ten poor person with the same food that you eat usually, to give them clothes or (if you cannot afford none of the above) three days of fasting. These hardships are imposed upon you so that you take your oaths seriously. God thus makes His Commandments plain to you so that you may show gratitude [for having laws for every situation and know what your responsibilities are.]