Is it obligatory to observe the order between prayers, or is it permissible to perform the present obligatory prayer and postpone the missed one? And is it permissible to make up each missed prayer with its corresponding current obligatory prayer? And does the invalidity of a previous prayer affect the validity of subsequent prayers due to the obligation of observing the order?

If a prayer becomes invalid due to the absence of a condition or a pillar, it must be repeated first. If one prays a subsequent prayer forgetfully or ignorantly, then their subsequent prayer is valid. However, if both prayers are current and one intentionally offers the second before the first, then the second prayer is not valid, because order is a condition for validity when one remembers.