The Quran

قُلِ ادعُوا الَّذينَ زَعَمتُم مِن دونِ اللَّهِ ۖ لا يَملِكونَ مِثقالَ ذَرَّةٍ فِي السَّماواتِ وَلا فِي الأَرضِ وَما لَهُم فيهِما مِن شِركٍ وَما لَهُ مِنهُم مِن ظَهيرٍ

Muhammad Asad

SAY: "Call upon those [beings] whom you imagine [to be endowed with divine powers] beside God: they have not an atom's weight of power either in the heavens or on earth, nor have they any share in [governing] either, nor does He [choose to] have any helper from among them."¹

I.e., anybody who would "mediate" between Him and any of His creatures. As is evident from the sequence (as well as from 17:56-57), this passage relates, in particular, to the attribution of divine or semi-divine qualities to saints and angels and to the problem of their "intercession" with God.