(… مُصَدِّقًا لِّمَا بَيْنَ يَدَيْهِ …) (…confirming that which came before him): Every message confirms that message came before it, certainly because they are from One Lord:

  شَرَعَ لَكُم مِّنَ الدِّينِ مَا وَصَّىٰ بِهِ نُوحًا وَالَّذِي أَوْحَيْنَا إِلَيْكَ وَمَا وَصَّيْنَا بِهِ إِبْرَاهِيمَ وَمُوسَىٰ وَعِيسَىٰ ۖ أَنْ أَقِيمُوا الدِّينَ وَلَا تَتَفَرَّقُوا فِيهِ ۚ 

(He has ordained for you of religion what He enjoined upon Noah and that which We have revealed to you, [O Muhammad], and what We enjoined upon Abraham and Moses and Jesus – to establish the religion and not be divided therein.) (Ash-Shura: 13)

(  وَآتَيْنَاهُ الْإِنجِيلَ فِيهِ هُدًى وَنُورٌ وَمُصَدِّقًا لِّمَا بَيْنَ يَدَيْهِ مِنَ التَّوْرَاةِ وَهُدًى وَمَوْعِظَةً لِّلْمُتَّقِينَ) (…and We gave him the Gospel, in which was guidance and light and confirming that which preceded it of the Torah as guidance and instruction for the righteous): Why does Allah (swt) repeat the description of the Bible as guidance? First of all, the Bible contains guidance and light, and all messages contain guidance, and it is the right path that leads to the path of Allah (swt) and the Light is the light of the values that control human movement in society, and it is the light that illuminates the darkness of society and the darkness of the soul..etc.

(  وَمَوْعِظَةً لِّلْمُتَّقِينَ… ) (…and instruction for the righteous): Allah (swt) describes the Gospel as instructions because it came with Spiritualities, whereas the rulings are taken from the Torah.