[Abu 'Eisa said:] There are narrations on this topic from Ibn 'Umar, Abu Sa'eed, Jarir, Abu Hurairah, Asma' bin Yazid, Al-Mughira bin Shu'bah, and Jabir.
[Abu 'Eisa said:] This Hadith is Hasan Sahih. 'Urwah is Ibn Al-Ja'd Al-Bariqi, and they say he is 'Urwah bin Al-Ja'd. Ahmad bin Hanbal said: "The Fiqh of this Hadith is that Jihad is with every Imam until the Day of Judgement."
In-book : Book 23, Hadith 25
English translation : Vol. 3, Book 21, Hadith 1694