Regarding the verse of Allah (swt):
(Say, “I am only a man like you, to whom has been revealed that your god is one God. So whoever would hope for the meeting with his Lord – let him do righteous work and not associate in the worship of his Lord anyone.”) [Quran 18:110]
والعياشي عن الصادق عليه السلام إنه سئل عن هذه الآية فقال العمل الصالح المعرفة بالأئمة ولا يشرك بعبادة ربه أحدا التسليم لعلي عليه السلام لا يشرك معه في الخلافة من ليس ذلك له ولا هو من أهله .
al-‘Ayyashi from al-Sadiq (as) that: he was asked about this verse so he said: “Righteous work” is knowing the Imams, “Not associate in the worship of his Lord anyone” to submit to ‘Ali (as) and not associate with him anyone in Khilafah who is not from its people.
والقمي عنه عليه السلام ولا يشرك بعبادة ربه أحدا قال لا يتخذ مع ولاية آل محمد صلوات الله عليهم غيرهم وولايتهم العمل الصالح من أشرك بعبادة ربه فقد أشرك بولايتنا وكفر بها وجحد أمير المؤمنين عليه السلام حقه وولايته .
al-Qummi from al-Sadiq (as): “Not associate in the worship of his Lord anyone” he said: To not accept a Wilayah besides the Wilayah of Aal-Muhammad peace be upon them, their Wilayah is the “Righteous work”, he who associates anyone in the worship of his lord has committed Shirk in our Wilayah and has made Kufr in it and rejected the right of Ameer al-Mumineen (as).
Source: Tafsir al-Safi vol3. pg.270.Article by Hani (aka TripolySunni) Posted by 13S2010