بسم الله الواحد القهار
Allamah Al-Majlisi:
[Qurb Al-Isnaad] As-Sindi Ibn Mohammad from Safwan Al-Jamal who said: ‘Abu Abdullah(عليه السلام), he said: I heard him saying: "When the matter of Wilayah was revealed about Ali, a man stood up from among the people, saying: 'Verily, this Messenger just tied a tie for this man(i.e. for Amirul-Muminin(عليه السلام)) that no one shall untie it except for a disbeliever.' So the second (i.e. the second usurper, Umar) came to him and said: 'O servant of Allah, who are you?' the man remained silent, so the second(i.e. Umar) went to the Messenger of Allah(صلى الله عليه وآله) and said: 'O Messenger of Allah, I saw a man among people saying: 'Verily, this Messenger just tied a tie for this man that no one shall untie it except for a disbeliever.', So he said: 'O so and so, that was Jibra'il, so be careful to not be the person who unties this tie and apostates.''"
Grading: Sahih(Authentic).
Check the narrators in the Rijaal section:
12: Aban Ibn Mohammad, known as As-Sindi
925: Safwan Ibn Mehran Al-Jammaal
Source: Bihaar Al-Anwaar, Vol. 37 Pg. 121