Surah Yunus Verse 20

وَيَقُولُونَ لَوْلاَ أُنزِلَ عَلَيْهِ آيَةٌ مِّن رَّبِّهِ فَقُلْ إِنَّمَا الْغَيْبُ لِلّهِ فَانْتَظِرُواْ إِنِّي مَعَكُم مِّنَ الْمُنتَظِرِينَ

“And they say: ‘Why is not a sign sent down to him from his Lord?’ Say: ‘Verily, the unseen is only for Allah, therefore wait; verily I am with you, among those who wait”

Imam Jafar Sadiq (as) narrates regarding this verses, Those who are “pious” are the Shiah of Ali (as). The unseen is the Decisive Hujjah who will be in occultation (ghaybat). Proof of this is in the saying of Allah, “And they say, “Why is not a sign sent down to him from his Lord? Say: “Verily, the unseen is only for Allah, therefore wait; verily, I am with you, among those who wait” (Kamaluddin, volume 2 page 340)