What is the ruling on combining prayers due to oversleeping and missing them?

Prayer is an emphasized obligation with specific times, and it is not permissible to offer it before or after its time except with a legitimate excuse. A Muslim must take measures to wake up for prayer. If sleep overcomes him after taking such measures, there is no sin upon him, and he should pray it upon waking up. If he is certain that the prayer time will expire due to sleep, he must pray before sleeping. When making up several missed prayers, he should start with the earliest one, then the next, unless the time for the current prayer is limited, in which case it should be prayed first. It is not permissible to combine prayers whose time has begun while the Muslim is awake.