Intercession is mentioned in the Quran in these verses:
[2:48] Beware of the day when no soul can avail another soul, no intercession will be accepted, no ransom can be paid, nor can anyone be helped.
[2:123] Beware of the day when no soul will help another soul, no ransom will be accepted, no intercession will be useful, and no one will be helped.
[2:254] O you who believe, you shall give to charity from the provisions we have given to you, before a day comes where there is no trade, no nepotism, and no intercession. The disbelievers are the unjust.
[20:109] On that day, intercession will be useless, except for those permitted by the Most Gracious, and whose utterances conform to His will.
[34:23] Intercession with Him will be in vain, unless it coincides with His will. When their minds are finally settled down, and they ask, “What did your Lord say,” they will say, “The truth.” He is the Most High, the Most Great.
[36:23] “Shall I set up beside Him gods? If the Most Gracious willed any harm for me, their intercession cannot help me one bit, nor can they rescue me.
[39:43] Have they invented intercessors to mediate between them and God? Say, “What if they do not possess any power, nor understanding?”
[39:44] Say, “All intercession belongs to God.” To Him belongs all sovereignty of the heavens and the earth, then to Him you will be returned.
[43:86] None of those whom they idolize beside Him possess any power to intercede, unless their intercession coincides with the truth, and they fully know.
[74:48] The intercession of the intercessors will never help them.
To learn more, read the Quran in English.
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