Thirdly...
Thirdly, that the Holy Prophet (S) is being addressed to hand over the key of the Ka’ba to Uthman bin Talha from whom it was taken when Mecca was conquered and which was intended to be given to Abbas (r.a.). In Basairud Darajat it is mentioned from reliable chains of narrators that Imam Baqir (a.s.) said that this verse is revealed in our praise (regarding us) and we seek help from Allah.
Likewise he is quoted that: It is obligatory for the Imam to hand over Imamate to the next Imam and that he should not take it back from him to pass it to another one.
According to another true narration he said that it means: We, the Imams, and it is obligatory that the former Imam must hand over to his successor the books which are with him and also the arms (weapons) of the Holy Prophet (S): and that when you judge between people you judge with justice, meaning ‘when you are appointed as Imam decide according to the just commandments which are with you.
It is reported with reliable chains of narrators that Imam Sadiq (a.s.) said, while explaining the verse: Surely Allah commands you to make over trusts to their that it means handing over of the trust of Imamate and the carrying out of legateeship. It also is authentically reported that Imam Baqir (a.s.) asked Malik Jahni as to about whom this verse has been revealed, he replied that the people say that it is about all the people.
The Hazrat said: Then all can decide for (and issue orders) to all because, in this verse the address is being made in plural, but it is not so, you must know that it is revealed in our praise. With authentic chains Imam Sadiq (a.s.) is reported to have said that the Imam can be recognized due to three virtues. Firstly, from the aspect of lineage he should be better and nobler than all like the Imam before him. Secondly, he must have Zulfiqar, which is the weapon of the Holy Prophet (S).
Thirdly, the previous one should have made him his legatee (Wasee) as regards this the Almighty Allah has said: Surely Allah commands you to make over trusts and said that the weapon is with us like the Chest (Taboot) of Bani Israel and that the Imamate and kingship is with the weaponry of the Prophet of Allah. The Imamate is exclusively for him who has the weapons of the Holy Prophet (S) as was the chest (Taboot) with Bani Israel and that to whomsoever the Taboot went he became the ruler.