And they say, "Why is a sign not sent down to him from his Lord?" So say, "The unseen is only for Allah [to administer], so wait; indeed, I am with you among those who wait."
The Saheeh International Quran Translation
وَيَقُولُونَ لَوْلَآ أُنزِلَ عَلَيْهِ ءَايَةٌ مِّن رَّبِّهِۦ فَقُلْ إِنَّمَا ٱلْغَيْبُ لِلَّهِ فَٱنتَظِرُوٓا۟ إِنِّى مَعَكُم مِّنَ ٱلْمُنتَظِرِينَAnd they say, "Why is a sign not sent down to him from his Lord?" So say, "The unseen is only for Allah [to administer], so wait; indeed, I am with you among those who wait."