The Quran

إِنَّ رَبَّكُمُ اللَّهُ الَّذي خَلَقَ السَّماواتِ وَالأَرضَ في سِتَّةِ أَيّامٍ ثُمَّ استَوىٰ عَلَى العَرشِ ۖ يُدَبِّرُ الأَمرَ ۖ ما مِن شَفيعٍ إِلّا مِن بَعدِ إِذنِهِ ۚ ذٰلِكُمُ اللَّهُ رَبُّكُم فَاعبُدوهُ ۚ أَفَلا تَذَكَّرونَ

Muhammad Asad

VERILY, your Sustainer is God, who has created the heavens and the earth in six aeons, and is established on the throne of His almightiness,¹ governing all that exists. There is none that could intercede with Him unless He grants leave therefor.² Thus is God, your Sustainer: worship, therefore, Him [alone]: will you not, then, keep this in mind?

See surah 7, note 43. Since belief in divine revelation naturally presupposes a belief in the existence of God as the self-subsistent fount of all being, the reference to the revelation of the Qur'an with which this surah opens is followed by a consideration of God's creative almightiness.
Lit., "there is no intercessor whatever, save after His leave [has been granted]". Cf. 2:255 - "Who is there that could intercede with Him, unless it be by His leave?" Thus, the Qur'an rejects the popular belief in unqualified "intercession" by living or dead saints or prophets. As is shown elsewhere in the Qur'an (e.g., in 20:109, 21:28 or 34:23), God will grant to His prophets on Judgment Day the permission to "intercede", symbolically, for such of the sinners as will have already achieved His redemptive acceptance (rida') by virtue of their repentance or basic goodness (see 19:87 and the corresponding note 74): in other words, the right of "intercession" thus granted to the prophets will be but an expression of God's approval of the latter. Furthermore, the above denial of the possibility of unqualified intercession stresses, indirectly, not only God's omniscience - which requires no "mediator" - but also the immutability of His will: and thus it connects with the preceding mention of His almightiness. (See also note 27 below.)