What is the ruling on making up missed prayers by starting with the Fajr prayer instead of the Dhuhr prayer? Is this considered negligence? Must the worship be repeated if a mistake in the ijtihad becomes clear? Does the Prophet's (peace be upon him) combining of prayers or his making them up in order indicate the obligation of sequential order?

Scholars differed concerning the ruling on the order of making up missed prayers, and the preponderant opinion is that the prayer is not invalidated by neglecting this order, especially with ignorance. The questioner is not required to re-perform what she missed. However, she is advised to maintain prayer at its prescribed time, and if it is missed, she should make it up in order, as this is more cautious. One who is ignorant of the order of missed prayers should begin with Dhuhr when making them up, while one who knows the order should start with the first missed prayer, such as Fajr, for example.

Method of Making Up Prayers: In addition to the five current daily prayers, a Muslim should pray as many missed prayers as possible, day and night, until all outstanding prayers are made up. If the number of missed prayers is known, that specific number should be made up. If not known, one should make up what is believed to be sufficient to clear their conscience.

Ibn Qudamah said: "If the missed prayers are numerous, one should busy themselves with making them up, as long as it does not cause hardship to their body or finances. If the amount owed is unknown, one should repeat prayers until certainty of having cleared their conscience is achieved. If a prayer from a specific day is forgotten and its exact identity is unknown, one should repeat the prayers of a day and a night."

It is advised to avoid obsessive doubts (waswas). One whose knowledge does not qualify them for independent juristic reasoning (ijtihad) should ask people of knowledge.