Is it obligatory to make up for missed prayers due to negligence in ritual purity for several years, and how should they be made up for?

If negligence in prayer means abandoning it or compromising its validity, then this necessitates immediate repentance, for abandoning prayer is one of the gravest major sins. The majority of scholars hold the view that missed prayers must be made up, while some believe that making them up is not obligatory, provided one resorts to supererogatory prayers. The more cautious approach, however, is to make them up.