The gravity of missing a fast of Ramadhan without any valid reason

Roza is Farz (obligatory) on every Muslim who is major and sane. A person should not neglect his fast without any valid reason because it is a grave sin to miss a fast without any valid reason.

According to the Hadith, a fast in Ramadhan, which was missed without any valid reason, cannot be replaced even if a person fasts his entire life. That is why, as far as possible, we must not miss the fasts of Ramadhan. However, if one happens to miss a fast, then, without doubt, one has to replace it. 

It is even more grave to break a fast of Ramadhan without any valid reason. Leave alone the Gunaah and the punishment - the fine itself is very severe and very hard. Its fine is: to fast 60 days consecutively (one after the other) and in addition to that, to replace the one fast that has been invalidated!

[English version of "Gravite manque ene roza de Ramadwan sans raison valable" – Al Jamiat – Vol.2 No.11]