Quran 34:29 — Sheba (Saba')

They challenge, "When will this promise come to pass, if you are truthful?"

[34:28] We have sent you (O Rashad)* to all the people, a bearer of good news, as well as a warner, but most people do not know.

[34:30] Say, "You have a specific time, on a specific day, that you cannot delay by one hour, nor advance."