Answer: Allama Tabatabai in "Al-Mizan" says:
The Almighty Lord has affirmed intercession in His noble speech, provided it is by His permission, without restricting it to this world or the hereafter, and said:
"Who is it that can intercede with Him except by His permission?" (Quran 2:255). Additionally, He said: "And those whom they invoke besides Him have no power of intercession, except those who bear witness to the truth knowingly" (Quran 43:86). As you can see, intercession is granted to those who bear witness to the truth with knowledge, and the most certain of these knowledgeable individuals are the prophets (peace be upon them), including our esteemed Prophet (SAWAS) and his 12 infallible successors (Imams).
So, even if there is room to doubt the intercession of the noble saints from the community, the intercession of these chosen individuals is beyond doubt, especially the Prophet Muhammad (SAWAS), whom God Himself has confirmed as a witness to the truth and said:
"And We will bring you as a witness over these [people]" (Quran 4:41).
Furthermore, regarding his knowledge, He said:
"And We have sent down to you the Book as clarification for all things" (Quran 16:89),
And also: "The Trustworthy Spirit has brought it down upon your heart" (Quran 26:193-194).
It is evident that when the Quran, which explains everything, is revealed to someone's heart, that person would be knowledgeable about the Quran. It is unreasonable to think otherwise, just as it is unreasonable to think that God would send someone as a witness who does not bear true testimony.
In the verse "That you may be witnesses over mankind" (Quran 2:143), and the verse "And that Allah may take martyrs from among you" (Quran 3:140), and the verse "And these examples We present to the people, but none will understand them except those of knowledge" (Quran 29:43), God establishes that in addition to the prophets, other martyrs and scholars within the Muslim community bear true testimony. It is clear that God affirms only the truth, so there are truthful witnesses within the Muslim community as well.
Specifically regarding the Prophet's household, God says:
"Indeed, Allah desires to remove all impurity from you, O people of the [Prophet’s] household, and purify you with a thorough purification" (Quran 33:33).
This verse indicates that the Prophet’s household has been purified by God. The verse:
"Indeed, it is a noble Quran in a well-protected Book; none touch it except the purified" (Quran 56:77-79) implies that only the purified understand the Quran. Consequently, it is proven that the Prophet’s household are the purified ones and knowledgeable about the Quran, which is an explanation of everything. They are among those who bear true witness without falsehood or error.
Therefore, it should not be said that seeking intercession through these noble individuals and making them intermediaries before God is shirk (associating partners with God).