They also say: "Tell us when this threat will come to pass, - Surah An-Naml ayat 71 in English

﴿وَيَقُولُونَ مَتَىٰ هَٰذَا ٱلۡوَعۡدُ إِن كُنتُمۡ صَٰدِقِينَ ﴾
[النَّمل: 71]

They also say: "Tell us when this threat will come to pass, if you are truthful

﴿ويقولون متى هذا الوعد إن كنتم صادقين﴾ [النَّمل: 71]

Abdel Haleem
They also say, ‘When will this promise be fulfilled if what you say is true?’

Abdul Hye
And they (disbelievers) say: “When will this Promise (be fulfilled), if you are truthful?”

Abdullah Yusuf Ali
They also say: "When will this promise (come to pass)? (Say) if ye are truthful

Abdul Majid Daryabadi
And they say: when will this Promise be fufilled if ye say sooth

Ahmed Ali
Yet they say: "When will this promise come to pass? (Tell Us) if you speak the truth

Aisha Bewley
They say, ´When will this promise be fulfilled if you are telling the truth?´

A. J. Arberry
They say, 'When shall this promise come to pass, if you speak the truth

Ali Quli Qarai
They say, ‘When will this promise be fulfilled, should you be truthful?’