Surah 20:109
"On that Day intercession will not be of any benefit, except for the one to whom the Merciful gives permission, and whose word He approves."
20.109 – On that Day intercession will not be of any benefit, except
This verse starts out like a prohibition but then – as in a number of other quranic passages – makes an exception. The Merciful will give permission for intercession to someone whose word he approves. See the analysis of verses on intercession at 39.44.
- from The Quran with Christian Commentary: A Guide to Understanding the Scripture of Islam