وَيَقُولُونَ لَوۡلَآ أُنزِلَ عَلَيۡهِ ءَايَةٞ مِّن رَّبِّهِۦۖ فَقُلۡ إِنَّمَا ٱلۡغَيۡبُ لِلَّهِ فَٱنتَظِرُوٓاْ إِنِّي مَعَكُم مِّنَ ٱلۡمُنتَظِرِينَ

Wa yaqooloona law laaa unzila 'alaihi aayatun mir Rabbihee faqul innamal ghaibu lillaahi fantaziroo innee ma'akum minal muntazireen

They say: "Why is not a sign sent down to him from his Lord?" Say: "The Unseen is only for Allah (to know), then wait ye: I too will wait with you."

— Yunus (يُونُس), 10:20