What are the rulings for making up many missed prayers, especially concerning: 1. Not making up the 'Isha prayer after making up the rest of the day's prayers; does this invalidate what was already made up? 2. The times when it is forbidden by Sharia to make up prayers? 3. Is it permissible to make up two days of missed prayers by combining their rak'ahs together?

The prayers that were performed facing the wrong Qibla must be made up if the worshiper was negligent in their effort (ijtihad) or in inquiring [about the correct direction]. They must also be made up if they were performed without ritual purity due to discharges or similar issues. Each prayer is to be made up independently, at any time of the night or day, even during the forbidden times for prayer. Each is performed with its specific number of rak'ahs and a distinct intention, with the importance of maintaining the order of making up missed prayers.