6:109 wa aqsamuu bil-laahi jahda aymaanihim lain jaa-at’hum aayatul la yu’minun-na bihaa* qul in-namal aayaatu ‘Indal-laah* wa maa yush’Irukum an-nahaa idhaa jaa-at laa yu’minuun

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Ahmed Raza Khan: Mohammed Aqib Qadri:
And they swore by Allah vehemently in their oaths that if any sign came to them, they will certainly believe in it; say, “The signs are with Allah, and what do you people know that if they came to them, they will not believe.”

Yusuf Ali:
They swear their strongest oaths by Allah, that if a (special) sign came to them, by it they would believe. Say: "Certainly (all) signs are in the power of Allah: but what will make you (Muslims) realise that (even) if (special) signs came, they will not believe."?

Pickthal:
And they swear a solemn oath by Allah that if there come unto them a portent they will believe therein. Say; Portents are with Allah and (so is) that which telleth you that if such came unto them they would not believe.