5:101 O You who have chosen to be graced with belief! Do not ask unnecessary details of things (as the Israelites asked of Moses about the cow 2:68.) This attitude may bring unpleasant consequences for you. But if you ask them as the Qur’an is being revealed, the minor details of Ordinances might be given which will be hard for you to follow. God has pardoned you in this respect, for God is Forgiving, Clement.
5:102 Some people before you asked such questions and then rejected the instructions. [2:68]
As per 5:101 it is the Mercy of Allah that minor details of things have not been given Qur’an but the promoters of Bukhari & Company denied the instructions of 5:101 and documented the details of things ,which were not given in Qur’an purposely e.g. the rate of Zakat and by doing so Bukarhi& company achieved its main objective of making Qur’an Mahjoor i.e immobilized it .
25:30 And the Messenger will say, “O My Lord! These are my people, the ones who had disabled this Qur’an making it of no account." [They had immobilized it like villagers who bind a cow by tying her front foot to her horn. Mahjoor = A cow thus immobilized]