Since his arrival in Syria in 2013, Muhaysini actively served as a preacher and judge, delivering sermons in local mosques, issuing religious verdicts and counseling Islamic groups. In addition he has appeared on the front lines a couple of times, motivating Syrian Opposition fighters and raising their morale. After the conquest of Idlib in 2015, he served as the official judge of the Army of Conquest for Idlib city. Working independently, Muhaysini has good ties to a great range of Islamic factions in Syria, which enables him to intervene in conflicts and settle on resolutions. In late 2013, Muhaysini posted his support for the then-active
Madid Ahl al-Sham campaign on Twitter while identifying one of the fundraiser's organizers,
Sa'd bin Sa'd Muhammad Shariyan Al Ka'bi, and its location in Qatar. Madid Ahl al-Sham was a Qatar-based fundraising campaign identified by Muhaysini and others for its financial assistance for
Jabhat al-Nusra. The
U.S. Department of State identified Madid Ahl al-Sham as a "fundraising campaign that was suspected of sending funds to violent extremist elements in Syria."
[viii] In early 2014 Muhaysini served as a mediator, this time between
ISIS and its rival jihadist groups, Al Nusra and
Ahrar al-Sham. He tried to effect a truce between Islamist factions, which was rejected by ISIS. When al-Qaeda disowned ISIS in early 2014, al-Muhaysini called on ISIS members to defect to al-Nusra Front. In July 2014 Muhaysini interceded in west Idlib during an FSA/Nusra conflict to mediate. In 2014, Muhaysini endorsed scholars of the pro-jihad movement like
Al-Balawi,
Eyad Quneibi,
Tareq Abdulhalim,
Hani al-Siba'i,
Yusuf al-Ahmed,
Abdulaziz al-Tureifi,
Suleiman al-Ulwan,
Abu Qatada al-Filistini, and
Abu Muhammad al-Maqdisi. Lebanese singer
Fadel Shaker received a message from Muhaysini in June 2015.
Hassan Nasrallah was challenged to a debate by Muhaysini in June 2016. In September 2015, he released a video showing the "Cubs of al-Aqsa" training camp for children. After the
Russian military intervention in Syria, al-Muhaysini threatened that Syria would be a "tomb for its invaders" or "graveyard for invaders" in response to the Russian intervention and brought up the
Soviet–Afghan War. Muhaysini arranged for foreign fighters of multiple backgrounds to repeat the phrase "The Levant is the graveyard of the Russians", in a video message, among them was a fighter claiming to be from "East Turkestan", according to
MEMRI. He declared that in Syria, women's participation in some theaters and jihad in general was obligatory after the Russian intervention.
Tawhid wal Jihad's leader Abu Saloh met with Abdullah Muhaysini in late 2015. In early 2016, Muhaysini denounced the starvation of Sunnis in besieged
Madaya, claiming that the starvation would cause the deaths of 40,000 Muslims there. The Saudi incarceration of
Abdulaziz Al Tarifi was decried by Muhaysini in April 2016 who warned against undermining the
religious police. In May 2016, he reportedly called for the substitution of the Turkish currency for the Syrian currency. In June 2016, denying rumors of his death or injury, Muhaysini gave a speech. Muhaysini publicly fundraised for the 2016 offensive to break the
Siege of Aleppo from donors in
Qatar and other Arabian Gulf states. In 2016, Muhaysini thanked donors for providing rockets to fighters in Syria. Muhaysini said in a video that Muslims would benefit from open hostility towards them by Trump. Muhaysini was listed for sanctions by the
US Treasury in November 2016. Muhaysini called himself a "national symbol" according to Syrians and expressed his "shock"" at being declared a terrorist by the United States Treasury when he spoke to
The New York Times. Muhaysini posted a video replying to the terrorist designation by the USA.
Media In October 2016, Turkish newspaper
Yeni Şafak interviewed Muhaysini, praising Turkey for its role in Syria and denouncing Iran. Muhaysini was many times interviewed by American journalist
Bilal Abdul Kareem, who leads a pro-opposition news agency called "On the Ground News TV'' (OGN TV) that reports from Syria.
Turkistan Islamic Party al-Muhaysini has close relations with the
Turkistan Islamic Party (TIP). He was featured, along with
Hani al Siba'ee,
Abu Qatada, and
Abdurazak al-Mahdi in a Turkistan Islamic Party video in August 2015. In August 2015, Abdullah Al-Muhaysini praised the
Turkistan Islamic Party fighters in their attacks against the "Nusayris" of Assad's army (Alawites). At the end of 2015, the Turkistan Islamic Party released a video titled "A Message to the Turkestanis" (رسالة الى التركستانيين) featuring Abdullah Al-Muhaysini, an Al-Qaeda cleric of Saudi origin. Muhaysini urged the "Turkistani Musims" to raise their children to love death like "infidels" love life. At the end of 2015, the Turkistan Islamic Party released a new video titled "Importance of Martyrdom Operations in Our Current Time" (أهمية العمليات الإستشهادية في زمننا الحاضر) (زامانىمىزدىكى پىدائىيلىق ئەمەلىيىتىنىڭ ئەھمىيىتى) by Abdullah al-Muhaysini. In 2016, the Turkish Islamist publisher
Beyaz Minare Kitap (White Minaret Book) published a Turkish language book titled ''"Türkistan'dan Şehadete Hicret Hikayeleri 1"'' containing the biographies of Turkistan Islamic Party fighters along with praise of TIP fighters by Abdullah al-Muhaysini.
Doğu Türkistan Bülteni Haber Ajansı reported that the Turkistan Islamic Party was praised by Abu Qatada along with
Abdul Razzaq al Mahdi,
Abu Muhammad al-Maqdisi, Muhaysini and
Zawahiri in late 2016. In 2016, Muhaysini visited Turkistan Islamic Party fighters before the battle and performed
dua.
Khan Tuman in Aleppo then came under attack by the TIP. A picture of Muhaysini with a Turkistan Islamic Party fighter in Khan Touman was released by the Turkistan Islamic Party after the battle. They displayed weapons and munitions seized during the battle. Corpses of what the TIP labelled as "Rawafid" (Shia) fighters and pictures of "Iranian" prisoners were released by the TIP. The Turkistan Islamic Party in Syria released "Blessed Are the Strangers #6" featuring a speech by
Hasan Mahsum, as well as by
Army of Conquest leader Abdullah al-Muhaysini and fellow scholar
Abdurazak al Mahdi at the start of 2017. In the video Abdul Razzaq al-Mahdi and Abdullah al-Muhaysini asked Muslims with money to aid the cause of the Turkistan Islamic Party and praised the Uyghur fighters for their role in the Syrian Civil War fighting against the Syrian government.
Tahrir al-Sham In January 2017, after attacks on
Jabhat Ahl al-Sham by
Jabhat Fateh al-Sham, Jabhat Fateh al-Sham was asked to desist by Muhaysini. Muhaysini, Abu Taher Al Hamawi, and
Abdelrazzak Mehdi worked on the formation of the group
Tahrir al-Sham (HTS) in January 2017. They are members of the group and appeared in its founding declaration. Attendance at a speech by Moheiseni was manipulated by drawing IDP impoverished people with promises of motorbikes and refrigerators through a raffle by HTS. Muhaysini and the Turkistan Islamic Party negotiated between Tahrir al-Sham and Liwa al-Aqsa in the
Idlib Governorate clashes (2017). In late 2017, Muhaysini was reported to have defected from HTS. He later, in May 2023, apparently due to fear of being targeted by HTS, reportedly relocated to Turkey.
Fall of the Assad regime Following the
fall of the Assad regime in December 2024, Muhaysini visited the
Umayyad Mosque in
Damascus and held a speech. == Controversy ==