(Thwaha) 20 : 133
وَقَالُوا لَوْلَا يَأْتِينَا بِآيَةٍ مِنْ رَبِّهِ ۚ أَوَلَمْ تَأْتِهِمْ بَيِّنَةُ مَا فِي الصُّحُفِ الْأُولَىٰ
And they are asking: "Why doesn’t he bring us a Sign from his Lord?" Hasn’t there come to them Evidence that is revealed in the previous Books?
All 313 Messengers are sent down with the Truth and Proof Adhikr as explained in verse 21: 24. Adhikr sent down to Messenger Muhammad contains all the previous 312 Books and their Upright explanations as explained in verse 16: 44. The Three-Time-Knower Lord teaches that nobody will become a believer by revealing Signs as explained in verses 17: 59-60. Man will have nothing except what he did intentionally as told in verse 53: 39. See explanation 11: 118-119 and 16: 89.