Key Verses

1. 2:186Al-BaqarahConsolation
   وَإِذَا سَأَلَكَ عِبَادِي عَنِّي فَإِنِّي قَرِيبٌۖ أُجِيبُ دَعۡوَةَ ٱلدَّاعِ إِذَا دَعَانِۖ فَلۡيَسۡتَجِيبُواْ لِي وَلۡيُؤۡمِنُواْ بِي لَعَلَّهُمۡ يَرۡشُدُونَ
   And when My servants question thee concerning Me, then surely I am nigh. I answer the prayer of the suppliant when he crieth unto Me. So let them hear My call and let them trust in Me, in order that they may be led aright.
   In context

   If they ask you, O Prophet, about how close Allah is and about His answering of prayers, Allah is close to them and knows everything about them. He hears their prayer, and they do not need intermediaries or to raise their voices.

2. 13:14Ar-RadCommand
   لَهُۥ دَعۡوَةُ ٱلۡحَقِّۚ وَٱلَّذِينَ يَدۡعُونَ مِن دُونِهِۦ لَا يَسۡتَجِيبُونَ لَهُم بِشَيۡءٍ إِلَّا كَبَٰسِطِ كَفَّيۡهِ إِلَى ٱلۡمَآءِ لِيَبۡلُغَ فَاهُ وَمَا هُوَ بِبَٰلِغِهِۦۚ وَمَا دُعَآءُ ٱلۡكَٰفِرِينَ إِلَّا فِي ضَلَٰلٖ
   Unto Him is the real prayer. Those unto whom they pray beside Allah respond to them not at all, save as (is the response to) one who stretcheth forth his hands toward water (asking) that it may come unto his mouth, and it will never reach it. The prayer of disbelievers goeth (far) astray.
   In context

   The call of monotheism is for Allah alone and no one shares this with Him. The idols on whom the idolaters call besides Him do not respond to the call of those who call them in any matter. Their calling them is simply like a thirsty person stretching his hand towards water for it to reach his mouth so that he can drink from it. The water is not going to reach his mouth.

3. 30:25Ar-RumPromise
   وَمِنۡ ءَايَٰتِهِۦٓ أَن تَقُومَ ٱلسَّمَآءُ وَٱلۡأَرۡضُ بِأَمۡرِهِۦۚ ثُمَّ إِذَا دَعَاكُمۡ دَعۡوَةٗ مِّنَ ٱلۡأَرۡضِ إِذَآ أَنتُمۡ تَخۡرُجُونَ
   And of His signs is this: The heavens and the earth stand fast by His command, and afterward, when He calleth you, lo! from the earth ye will emerge.
   In context

   And from among the signs of Allah which prove His power and oneness, is the upstanding of the sky without it falling and the earth not falling apart due to His command. Then, when He will call you once from the earth by the angel blowing the trumpet, you will suddenly emerge from your graves to give account and be requited.

4. 40:43Ghafir
   لَا جَرَمَ أَنَّمَا تَدۡعُونَنِيٓ إِلَيۡهِ لَيۡسَ لَهُۥ دَعۡوَةٞ فِي ٱلدُّنۡيَا وَلَا فِي ٱلۡأٓخِرَةِ وَأَنَّ مَرَدَّنَآ إِلَى ٱللَّهِ وَأَنَّ ٱلۡمُسۡرِفِينَ هُمۡ أَصۡحَٰبُ ٱلنَّارِ
   Assuredly that whereunto ye call me hath no claim in the world or in the Hereafter, and our return will be unto Allah, and the prodigals will be owners of the Fire.
   In context

   Truly, what you call me to have faith in and obey is not fit to be called to in this world or the Hereafter nor does it respond to whoever calls upon it. The return of us all is to Allah alone and those who transgress in disbelief and sins are the people of the fire who will enter it forever on the day of judgment.