Quran 34:45 — Sheba (Saba')

Those before them disbelieved, and even though they did not see one-tenth* of (the miracle) we have given to this generation, when they disbelieved My messengers, how severe was My retribution!

[34:44] We did not give them any other books to study, nor did we send to them before you another warner.

[34:46] Say, "I ask you to do one thing: Devote yourselves to GOD, in pairs or as individuals, then reflect. Your friend (Rashad) is not crazy. He is a manifest warner to you, just before the advent of a terrible retribution."