A fatwā is an Islamic legal pronouncement, issued by an expert in religious law (mufti), pertaining to a specific issue, usually at the request of an individual or judge to resolve an issue where Islamic jurisprudence (fiqh), is unclear. Typically, such uncertainty arises as Muslim society works to address new issues
The fatwā is not based upon the mufti’s own will and ideas, but rendered in accordance with fixed precedents from the sources of Islamic law.
In order to issue an authorized fatwā using his individual skills of reasoning, the mufti or scholar must meet the standards of ijtihād. This is the highest standard in issuing a juristic ruling. In general, this means he must be able to distinguish between the other scholars’ positions and their supporting evidence, and judge one stronger according to the strength or weakness of the evidence.
The primary difference between common-law opinions and fatwās, however, is that fatwās are not universally binding; as Sharia is not universally consistent and Islam is very non-hierarchical in structure, fatwās do not carry the sort of weight as that of secular common-law opinion.
Under the Muslim Law a gift is a transfer of property or right by one person to another in accordance with the provisions provided under Muslim law. Hiba (Tamlik al ain) , is an immediate and unconditional transfer of the ownership of some property or of some right, without any consideration or with some return (ewaz); and The term ‘hiba’ and ‘gift’ are often indiscriminately used but the term hiba is only one of the kinds of transactions which are covered by the general term ‘gift’.
If the Hiba had been done by observing the three essential ingredients to make it legal, then it cannot be revoked or cancelled.