The Ahmadiah Idrisiah Tariqah is a tariqah that emerged and centred in Asir,(Arab Saudi) in the 19th century. It was founded by Shaykh Sayyid Ahmad bin Idris 'Ali al-Mashishi al-Yamlakhi al-Hasmi 
.
Since young Shaykh Sayyid Ahmad ibn Idris was educated in an environment that is filled with zuhud and knowledge and he had trained and thought many well known scholars and sufi masters in his era. Based on the education background of Shaykh Sayyid Ahmad bin Idris , it is clear that he had inherited knowledge which are encompassing, especially in hadith, tafsir, fiqh (4 mazhab) dan tasawwuf. If we scrutinised the chain of transmissions that were obtained from world reknowned scholars like al-Muhaddith Shaykh Yasin al-Fadani , Shaykh Sayyid Abbas ibn Abdul Aziz al-Maliki , al-Muhaddith Tuan Shaykh Sayyid Muhammad ibn ‘Alwi al-Maliki and others, we will find the name of Shaykh Sayyid Ahmad ibn Idris among those that are listed in their chain of transmission. Also, Shaykh Sayyid Ahmad ibn Idris is well known to narrate the Musalsal Hadiths and obtained the chain of transmission of ‘Aali [1], for example, the length chain of transmission between Shaykh Sayyid Ahmad ibn Idris and Imam al Bukhari includes onlyi 9 narrators.
Besides possessing the knowledge of al-Quran, Hadiths,Tafsir, Aqidah dan Fiqh, As Shaykh also studied the knowledge of tasawuf until he got the authorisation from Tuan Shaykh Sayyid Abu Al-Mawahib Abdul Wahhab at-Tazi to spread this knowledge as a sufi master of the Khidriah Tariqah. His other spiritual master in the field of tasawuf includes Shaykh Abdul Qosim Al-Wazir (Syaziliah Tariqah ) dan Shaykh Hasan Al-Qina’i (Khalwatiah Tariqah ) .[2]
Here we acknowledge that Shaykh Sayyid Ahmad ibn Idris had mastered and taught various Tariqah. The tariqahs that he had inherited includes Naqshabandiah Tariqah, Qadiriah Tariqah, amongst others.[3]
Also, it was narrated by Shaykh Muhammad bin Ali as-Sanusi that during his understudy with Shaykh Sayyid Ahmad bin Idris , besides the Khidiriah Tariqahin, As Shaykh had taught him other Tariqahs namely, the Nasiriah Tariqah, Naqsyabandiah Tariqah, Uwaysiah Tariqah, Suhrawardiah Tariqah, Shadziliah Tariqah, Hatimiyazamqiah Tariqah dan QadariahTariqah, until Shaykh Muhammad As-Sanusi regards him as "Qutb". [4]
Yusuf bin Ismail al-Nabhani author of kitab Jami' Karamat al-Auliya, pictured Shaykh Sayyid Ahmad bin Idris as a Shaykh who manage to synergise and master both outward knowledge(syari'ah) and inward knowledge(tasawuf). He also acquired and submerged himself in the knowledge of al-Quran dan Hadiths through Kasyf(spiritual acquisition).
Al-‘Arif billah Tuan Shaykh Sayyid Muhammad al-Sanusi named this tariqah as al-Tariqah al-Muhammadiah. He said “I transmitted this al-Tariqah al-Muhammadiah ini from various transmission. The highest transmission that we acquired is from our shakyh Qutb al-‘Arifin Imam al-Muhaqqiqin Maulana Sayyid Ahmad bin Idris …”[5]
The great significance about this tariqah is that it was acquired and transmitted directly from Rasulullah 
in all aspects. Every spiritual works that are taught and practiced in this tariqah is regarded as an inheritance and transmission from Rasulullah and his Sunnah.
And our Shaykh Sayyid Ahmad bin Idris named this tariqah by the name of Ahmadiah, which is named after him – may Allah purify his soul – because Rasulullah specifically taught him this tariqah with the zikir and spiritual works that are complete, prayers that move hearts and sources which are aplenty.[6]
Shaykh Sayyid Ahmad bin Idris acquired the knowledge of this Tariqah directly from Rasulullah [7]. In the meeting (termed as 'suri') between Shaykh Sayyid Ahmad bin Idris with Rasulullah , Khidr 
the prophet, was also present. Rasulullah instructed Saiyidina Khidr to teach Shaykh Sayyid Ahmad the verses from the zikir of the Syaziliyah Tariqah. After that, Rasulullah instructed prophet Khidr to teach Shaykh Sayyid Ahmad the zikir, selawat and istighfar that is the most significant and eminent. And so the prophet of Allah, Khidr taught Shaykh Sayyid Ahmad the sayings of the Tahlil Khusus, Selawat Azimiah and Istighfar Kabir. [8] In that meeting, Rasulullah also explained to Shaykh Sayyid Ahmad on the significance anf secrets of the Tahlil Khusus, Selawat Azimiah dan Istighfar Kabir. Afterwards Rasulullah transmitted those dzikir to Shaykh Sayyid Ahmad directly, without any intercessor. [9]
And so this great tariqah was inherited and formed, lead and propagated by the distinguished sufi master al-Qutb al-Muhaqiqqin Tuan Shaykh Sayyid Ahmad ibn Idris .
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