Yusuf Ali
They say: "When will this promise come to pass,- if ye speak the truth?"

Sahih International
And they say, "When is [the fulfillment of] this promise, if you should be truthful?"

Shakir
And they say: When will this threat come about, if you are truthful?

Pickthall
And they say: When will this promise be fulfilled, if ye are truthful?

محمد جالندھری
اور یہ کہتے ہیں کہ اگر تم سچے ہو تو (جس عذاب کا) یہ وعدہ (ہے وہ آئے گا) کب؟