(Saba'a) 34 : 6
وَيَرَى الَّذِينَ أُوتُوا الْعِلْمَ الَّذِي أُنْزِلَ إِلَيْكَ مِنْ رَبِّكَ هُوَ الْحَقَّ وَيَهْدِي إِلَىٰ صِرَاطِ الْعَزِيزِ الْحَمِيدِ
And those who are given the Knowledge before will see that what is revealed to you from the Lord is the Truth, and It will guide you to the Path of the excellent, the praiseworthy.
Those who were given Adhikr-the Knowledge-before know that the Splendid Book Adhikr revealed to Messenger Muhammed is the Truth revealed from the Lord of the universe and It is the Ticket to Paradise. See explanation 2: 119; 3: 18; 17: 107.