The consequence of failure to pay zakat has been a subject of extensive legal debate in traditional Islamic jurisprudence, particularly when a Muslim is willing to pay zakat but refuses to pay it to a certain group or the state. According to classical jurists, if the collector is unjust in the collection of zakat but just in its distribution, the concealment of property from him is allowed. If, on the other hand, the collector is just in the collection but unjust in the distribution, the concealment of property from him is an obligation ("wajib"). Furthermore, if the zakat is concealed from a just collector because the property owner wanted to pay his zakat to the poor himself, they held that he should not be punished for it. If collection of zakat by force was not possible, use of military force to extract it was seen as justified, as was done by Abu Bakr during the Ridda Wars, on the argument that refusing to submit to just orders is a form of treason. However, Abu Hanifa, the founder of the Hanafi school, disapproved of fighting when the property owners undertake to distribute the zakat to the poor themselves.