Ibrahim, considered to be his single most influential work, and Al-Kawashif al-Jaliyya fi Kufr al-Dawla al-Sa'udiyya, where he declared the Saudi state to be infidels. He also confronted the members of Takfir wal-Hijra and wrote a book refuting their extreme views. In 1992, he returned to Jordan. He began to denounce the Jordanian government and what he believed were the man-made laws being implemented there. He was also the first prominent Islamist scholar to brand the House of Saud as unbelievers or takfir, and to hold the adoption of democracy as tantamount to apostasy. His teachings gained many adherents and this earned him the attention of the Jordanian government, and he was arrested and imprisoned. During the years 1995–99 both he and al-Zarqawi were in prison together and he exerted a strong influence on al-Zarqawi, shaping his Islamist ideology. Their strategic plans were described by Fouad Hussein in his book Al-Zarqawi: The Second Generation of Al Qaeda. After they were released from prison, al-Zarqawi departed for Afghanistan while Maqdisi stayed in Jordan. He was later rearrested on terrorism charges for conspiring to attack American targets in Jordan. He was released again in July 2005, but arrested again after he gave an interview to al Jazeera. In 2009 he defended himself against "younger extremists accus[ing] him of going soft" by quoting the American Combating Terrorism Center at West Point, which identified him "as a dangerous and influential jihadi theorist." Maqdisi served a five-year term in a Jordanian prison for allegations of jeopardising state security and recruiting jihadists to fight in Afghanistan. He was released in June 2014 by the Jordanian government, in a move speculated to be motivated by their opposition to the Islamic State of Iraq and the Levant. On 21 September 2014, he advocated for the release of British hostage, Alan Henning. Al-Maqdisi said, "Henning worked with a charitable organization led by Muslims which sent several aid convoys to help the Syrian people. Is it reasonable that his reward is being kidnapped and slaughtered? ... He should be rewarded with thanks. ..We call on the (Islamic) State to release this man (Henning) and other aid group employees who enter the land of Muslims with a guarantee of protection ... according to the judgment of Shariah law," he said." Maqdisi has also told those thinking of fighting for the Yemeni government against the Shia insurgency of the Houthis, that they