The ruling on breaking voluntary fasting on Monday and Thursday

Question:
The questioner Abu Samir says: If I am fasting voluntarily on Monday or Thursday, am I allowed to break my fast? If I break the fast, do I have to make it up? And are there any hadiths regarding fasting on Monday and Thursday?

Answer:
Yes, there are hadiths regarding the virtue of fasting on Monday and fasting on Thursday, because at that time deeds are presented to Allah (Glorified and Exalted is He). The Prophet (peace and blessings be upon him) used to fast on Monday and say that it is the day on which deeds are presented, and he loved for his deeds to be presented while he was fasting. You fast on Monday and Thursday voluntarily. You are not required to complete it, because completing voluntary fasting is not obligatory. So if you break it, there is no harm on you, but you will miss out on the reward and recompense only. You have not committed a sin, and you do not have to make it up either, because making up a fast is only for the obligatory, whereas the voluntary is not made up.