	During the first Russo-Persian War (1804–1813), Fath Ali Shah's son and heir, Abbas Mirza, who was conducting the campaign, turned to the new ulama and obtained from Shaykh Ja'far Kashif al-Ghita' and other eminent clerics in Najaf and Isfahan a declaration of jihad against the Russians, thus implicitly recognizing their authority to issue such a declaration – one of the functions of the Hidden Imām. Kashif al-Ghita used the opportunity to extract from the state acknowledgment of the ulama's right to collect the religious taxes of Khums."