Zayd was a revered member of the
Bayt (Household) of
Muhammad. Scholars, Saints, Sufis and Imams alike, all spoke of him in respectful terms. When the ascetic Umayyad Caliph
Umar ibn Abd al-Aziz was the Governor of Madinah during the reign of Al-Walid and Suleiman, he was an associate of Zayd ibn Ali. Zayd continued to correspond and advise him when he became the
Khalifah. Zayd is believed the first narrator of
Al-Sahifa al-Sajjadiyya of Imam Zainul-'Abidin. Several works of
hadith, theology, and
Qur'anic exegesis are attributed to him. The first work of Islamic jurisprudence Mujmu'-al-Fiqh is attributed to him. The only surviving hand-written manuscript of this work dating back to at least a thousand years is preserved in the pope's library, Bibliotheca Vaticana in Vatican City under "
Vaticani arabi". Photocopies of this rare work are available in several libraries including the Library of the
University of Birmingham in the
United Kingdom. In 2007, Sayyid Nafis Shah Al-Husayni
Sayed Nafees al-Hussaini obtained a copy of this work, and re-issued it from
Lahore. He was an excellent orator and spent much of his life learning and educating others. It is said that his half-brother, Imam al-Baqir, wanted to test him on the Quranic knowledge, asking him various questions for which he received answers beyond his expectation, causing to him to remark, "For our father and mother's life! You are one of a kind. God grace your mother who gave you birth, she gave birth to a replica of your forefathers!" Al-Baqir also said: "No one of us was born to resemble 'Ali
ibn Abi Talib more than he did." When describing Zayd, his nephew, Imam
Ja'far al-Sadiq, said: "Among us he was the best read in the Holy Qur'an, and the most knowledgeable about religion, and the most caring towards family and relatives." Hence his title
Ḥalīf Al-Qurʾān (). Jafar Sadiq's love for his uncle Zayd was immense. Upon receiving and reading the letter of Zayd ibn Ali's death he broke down and cried uncontrollably, and proclaimed aloud: Imam
Ali ar-Ridha said: In one
hadith, the
Sunni Imam
Abu Hanifa once said about Imam Zayd, "I met with Zayd and I never saw in his generation a person more knowledgeable, as quick a thinker, or more eloquent than he was." However, in another hadith, Abu Hanifa said: "I have not seen anyone with more knowledge than Ja'far ibn Muhammad." Imam Abu Hanifa was reportedly a student of Imam Ja'far, like another great Imam of Sunni
Fiqh, that is
Malik ibn Anas. The
Sufi scholar,
Mujtahid and mystic,
Sufyan al-Thawri, respected Imam Zayd's knowledge and character, saying "Zayd took the place of Imam
al-Husayn. He was the most versed human concerning Allah's holy book. I affirm: women have not given birth to the likes of Zayd ... "
Al-Shaykh Al-Mufid the writer of the famous Shi'ah book Kitab al Irshad described him as, " ... a devout worshipper, pious, a jurist, God-fearing and brave." ==Prophecy of martyrdom==