Saudi Arabia's National Commercial Bank is going ahead with an initial public offering worth $6 billion despite opposition from Muslim clerics. The IPO from Sunday, making NCB the last Saudi bank to go public, is expected to be one of the largest in the world this year. However, Abdullah al-Mutlaq, a member of the kingdom's official Council of Senior Ulemas, said that the IPO is haram, or forbidden under Islamic tenets which ban usury. On the other hand, NCB's sharia advisory council on Thursday declared the share offer to be acceptable under Islamic law. An NCB prospectus says the bank will offer 300 million shares to the public at 45 riyals ($12) each, for a value of $3.6 billion, while another 200 million shares will be allocated to the state pension agency bringing the total to $6 billion.