Surah Az-Zukhruf (The Ornaments of Gold), Verse 86

وَلَا یَمْلِكُ الَّذِیْنَ یَدْعُوْنَ مِنْ دُوْنِهِ الشَّفَاعَةَ اِلَّا مَنْ شَهِدَ بِالْحَقِّ وَهُمْ یَعْلَمُوْنَ ۟

Wa laa yamlikul lazeena yad'oona min doonihish shafaa'ata illaa man shahida bilhaqqi wa hum ya'lamoon

“And those whom they invoke besides Allah have no power of intercession;- only he who bears witness to the Truth, and they know (him).”

Quran 43:86 (Yusuf Ali Translation)