To Him [alone] is the supplication of truth. And those they call (13:14)

﴿لَهُ دَعْوَةُ الْحَقِّ ۖ وَالَّذِينَ يَدْعُونَ مِن دُونِهِ لَا يَسْتَجِيبُونَ لَهُم بِشَيْءٍ إِلَّا كَبَاسِطِ كَفَّيْهِ إِلَى الْمَاءِ لِيَبْلُغَ فَاهُ وَمَا هُوَ بِبَالِغِهِ ۚ وَمَا دُعَاءُ الْكَافِرِينَ إِلَّا فِي ضَلَالٍ﴾
[ الرعد: 14]

13:14 To Him [alone] is the supplication of truth. And those they call upon besides Him do not respond to them with a thing, except as one who stretches his hands toward water [from afar, calling it] to reach his mouth, but it will not reach it [thus]. And the supplication of the disbelievers is not but in error [i.e. futility].

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.
The call of the disbelievers to their idols is only in vain and far from being right, because they have no power to draw any benefit for them nor ward off any harm from them.

For Him (Alone) is the Word of Truth (i.e. none has the right to be worshipped but He). And those whom they (polytheists and disbelievers) invoke, answer them no more than one who stretches forth his hand (at the edge of a deep well) for water to reach his mouth, but it reaches him not, and the invocation of the disbelievers is nothing but an error (i.e. of no use).

phonetic Transliteration

Lahu daAAwatu alhaqqi waallatheena yadAAoona min doonihi la yastajeeboona lahum bishayin illa kabasiti kaffayhi ila almai liyablugha fahu wama huwa bibalighihi wama duAAao alkafireena illa fee dalalin

Abdullah Yusuf Ali - Translation

For Him (alone) is prayer in Truth: any others that they call upon besides Him hear them no more than if they were to stretch forth their hands for water to reach their mouths but it reaches them not: for the prayer of those without Faith is nothing but (futile) wandering (in the mind).

Safi-ur-Rahman al-Mubarakpuri

For Him is the Word of Truth. And those whom they invoke besides Him, answer them no more than one who stretches forth his hand for water to reach his mouth, but it reaches him not; and the invocation of the disbelievers is nothing but misguidance.

Page 251 English transliteration