should he perform tayammum (dry ablution) or not? Does tayammum take the place of ritual ablution in the circumstances mentioned, or not?

When the crescent of Ramadan is obscured, which is better: fasting or not fasting? Or is one free to choose between them? Or is one of them recommended?

Regarding everything that the Prophet, may Allah bless him and grant him peace, consistently practised—in his deeds, circumstances, words, movements and moments of stillness, and in all his affairs, whether acts of worship or everyday habits—is consistently following all of this a sunnah for every member of the Muslim community? Or does this vary according to the different ranks and those occupying them? Please give us your ruling; may you be rewarded.

He replied:

All praise is due to Allah. These disputed questions concerning the manner of performing acts of worship fall into four categories.

One category comprises matters in which it is established that the Prophet, may Allah bless him and grant him peace, instituted both alternatives, and the Muslim community agrees that whoever follows either incurs no sin, although they may disagree over which is preferable. This is comparable to the modes of Quranic recitation established from the Prophet, may Allah bless him and grant him peace, which people agree may be used interchangeably, such as the recitations well known among Muslims. A Muslim may recite according to whichever of these he wishes, even if he prefers some of them for one reason or another.

Also belonging to this category are the opening supplications transmitted from the Prophet, may Allah bless him and grant him peace