In The name of Allaah, The Most Merciful, The Bestower of Mercy.
Opening Soorah of the Qur’aan (i.e. Faatiha) and closing Soorah of the Qur’aan (i.e. An-Naas) gather The Three categories of Tawheed; namely: Tawheed Ar-Roboobiyyah (The Oneness of Allaah’s Lordship); Tawheed Al-Uloohiyyah (Allaah is the only deity worthy of worship) and Tawheed al-Asmaa Was-Sifaat (The Oneness of Allaah in His Names and Attributes)
See Highlighted verses as proof:
الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ
مَالِكِ يَوْمِ الدِّينِ
إِيَّاكَ نَعْبُدُ وَإِيَّاكَ نَسْتَعِينُ
All the praises and thanks be to Allah, the Lord of the ‘Alamin (mankind, jinns and all that exists). The Most Beneficent, the Most Merciful. The Only Owner (and the Only Ruling Judge) of the Day of Recompense (i.e. the Day of Resurrection). You (Alone) we worship, and You (Alone) we ask for help (for each and everything). Guide us to the Straight Way. The Way of those on whom You have bestowed Your Grace, not (the way) of those who earned Your Anger (such as the Jews), nor of those who went astray (such as the Christians).”
قُلْ أَعُوذُ بِرَبِّ النَّاسِ
Say: “I seek refuge with (Allah) the Lord of mankind. The King of mankind. The Ilah (God) of mankind. From the evil of the whisperer (devil who whispers evil in the hearts of men) who withdraws (from his whispering in one’s heart after one remembers Allah). Who whispers in the breasts of mankind. Of jinns and men.
[Source: Mukhtasarul Mufeed Fee Bayaani Dalaa-il Aqsaam at-tawheed: lesson: 2. by Shaikh Abdur-Razzaaq al Badr (may Allaah preserve him]