There is no intercession of anyone for anyone...
There is no intercession of anyone for anyone, even the Messenger of Allah, the Blessings of Allah be upon him and his family, the Infallibles (The Ma'soomeen), peace be upon them, except by His permission. As for the respect of their graves or the plea through them, then, it is not considered worship of them at all.
Raising of Prophets We believe that Allah, the exalted, raises Prophets and dispatches them as Messengers in order to guide His servants and lead them out of the darkness of ignorance and misery to the light of knowledge, purity and well being, because Allah created man for well being. According to this, He augments all of the means of well being in man's essence and in the vast universe. (We believe) that the dispatching of prophets is only for the perfection of these aims.
That the teachings of Prophets and divine laws are only perfected elements for the character of man and his nature. Every law contradicting the nature of man, its creation is not from Allah's side. We believe that the aim of Prophets is proper education; proper instruction; to anchor the principles of ethics; to strengthen its support in the scope of human relations; to establish order and to apply justice in human society.
The Glorious Qur’an has already clarified each of these matters and rights in numerous verses. We respect all of the Prophets and Messengers without exception. However, we believe that the previous divine scriptures are tainted with superstitions and the hands of alterations were engaged throughout the long course of time and at the end of its era.
The One Most Truthful and Living bears witness that those disgraceful and shameful (acts) were ascribed to Allah, the Creator of the universe and Deity of the worlds. (Also, they attributed disgraceful and shameful acts) to the pure Prophets and Messengers, upon them all be peace. The Qur’an is the only peerless divine scripture which is in our hand without change or alteration.
The Day of Judgment Like all Muslims, we believe that all of mankind will be gathered on a particular day in another world: the eternal, everlasting world, to be given the reward of the virtuous deeds and the wicked deeds. (We believe) that every deed, good or bad, however small, will be accounted for on that day. (We believe) that the (knowledge of mankind's) account is preserved with Allah and (We believe) that He will never wrong anyone.