“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)