First:
What is the definition of a Prophetic hadith? Is it whatever he said during his lifetime, what he said after his prophetic mission began, or what he said by way of legislation?

Second:
What constitutes a single hadith? Is it comparable to a surah, a verse, or a sentence?

Third:
If a hadith is sound, must it necessarily be true, or not?

Fourth:
Is dividing hadiths into sound, good, and weak a valid classification, or do these categories overlap?

Fifth:
What constitutes a repeated hadith, retold in different wording, its meaning conveyed without addition or omission? Is it like the accounts repeated in the magnificent Quran?

Sixth:
How many hadiths are there in Sahīh al-Bukhārī, including repetitions, and how many excluding them? How many are there in Muslim’s collection, with and without repetitions? How many hadiths do both collections share, and how many does each contain that the other does not?

Shaykh al-Islām Abū al-ʿAbbās Ibn Taymiyyah—may Allah have mercy on him—replied:

All praise belongs to Allah, Lord of all worlds. When used without qualification, the term “Prophetic hadith” refers