God does not take you to task for a slip (or blunder of speech) in your oaths, but He takes you to task for what you have concluded by solemn, deliberate oaths. The expiation (for breaking such oaths) is to feed ten destitute persons (or one person for ten days) with the average of the food you serve to your families, or to clothe them, or to set free a slave. If anyone does not find (the means to do that), let him fast for three days. That is the expiation for your oaths when you have sworn (and broken them). But be mindful of your oaths (do not make them lightly, and when you have sworn them, fulfill them). Thus God makes clear to you His Revelations (the lights of His way), that you may give thanks (from the heart and in speech, and in action by fulfilling His commandments).