إن الله سبحانه وتعالى جعل ذرية كل نبي في صلبه، وإن الله تعالى جعل ذريتي في صلب علي بن أبي طالب رضي الله عنه.
Verily Allah subhanahu wa ta ‘ala made the progeny (continue) of every Prophet through his backbone (i.e. offspring). And verily Allah subhanahu wa ta ‘ala made my progeny (continue) through the backbone of ‘Ali ibn Abi Talib radiya Llahu ‘anhu.
This hadith is narrated from Jabir and Ibn ‘Abbas radiya Llahu ‘anhuma.
Al Tabarani and others narrate — from Yahya ibn al ‘Alaʾ al Razi — from Jafar ibn Muhammad — from his father — from Jabir radiya Llahu ‘anhu.
Imam Ahmed says that Yahya ibn al ‘Alaʾ al Razi is a kadhdhab (liar) and he fabricates hadith.
Al Khatib narrates this version of the hadith with a chain of transmission that contains the narrator al Marzubani. There is a difference of opinion regarding his status. Some consider him a thiqah (reliable) and others consider him a kadhdhab (liar).
I have not seen anyone regard his teacher as a thiqah (reliable).
His father is unknown.
Ibn al Jawzi was adamant that the hadith was not authentic.
Al Dhahabi and al Albani ruled the hadith to be a fabrication. 
 Al Tabarani: al Mujam al Kabir, 3/2630.
 Al Khatib: Tarikh Baghdad, 1/316.
 Ibn al Jawzi: al ‘Ilal al Mutanahiyah, 1/338.
 Al Dhahabi: Talkhis al ‘Ilal, hadith no. 73; al Albani: Silsilat al Ahadith al Da’ifah, 2/801.