Quran english Az Zukhruf 86

ولا يملك الذين يدعون من دونه الشفاعة إلا من شهد بالحق وهم يعلمون

Wala yamliku allatheenayadAAoona min doonihi ashshafaAAata illaman shahida bilhaqqi wahum yaAAlamoon

 
Sahih International
And those they invoke besides Him do not possess [power of] intercession; but only those who testify to the truth [can benefit], and they know.
Muhsin Khan
And those whom they invoke instead of Him have no power of intercession; except those who bear witness to the truth (i.e. believed in the Oneness of Allah, and obeyed His Orders), and they know (the facts about the Oneness of Allah).
Pickthall
And those unto whom they cry instead of Him possess no power of intercession, saving him who beareth witness unto the Truth knowingly.
Yusuf Ali
And those whom they invoke besides Allah have no power of intercession;- only he who bears witness to the Truth, and they know (him).
Shakir
And those whom they call upon besides Him have no authority for intercession, but he who bears witness of the truth and they know (him).
Dr. Ghali
And the ones they invoke, apart from Him, do not possess (the power) of intercession, excepting him who witnesses to the Truth, and they know it.