Ansari was a commentator on the Qur'an, scholar of the Hanbali school of thought (madhhab), traditionalist, polemicist and spiritual master, known for his oratory and poetic talents in Arabic and Persian.

[11] In the reign of the third Rashid Caliph, Uthman, Abu Mansoor al-Taabi'i took part in the conquest of Khorasan, and subsequently settled in Herat, his descendant Khwajah Abdullah Ansari died there in Dhū al-Ḥijjah 481/February-March 1089.

Some settlements of the descendants of Abdullah Ansari are in, Jais(Jayas), Gorakhpur, Yusufpur, Mau, Saharanpur, Punjab, Kakori and the scholars at the famous university in Lucknow, Firangi Mahal.

[13][14][15][16] He was one of the first Sufis to write in Persian, which he wrote in a local dialect, thus indicating that he wanted to spread his teachings to the general populace instead of just to the ulama, who knew Arabic.

[20] Ibn Qayyim al-Jawziyya refers to Ansari with the honorific title "Sheikh al-Islam" in his work Al-Wabil al-Sayyib min al-Kalim al-Tayyab [20]