شَهِدَ ٱللَّهُ أَنَّهُۥ لَآ إِلَـٰهَ إِلَّا هُوَ وَٱلْمَلَـٰٓئِكَةُ وَأُو۟لُوا۟ ٱلْعِلْمِ قَآئِمًۢا بِٱلْقِسْطِ ۚ لَآ إِلَـٰهَ إِلَّا هُوَ ٱلْعَزِيزُ ٱلْحَكِيمُ Qur’an Aal-Imran (3:18)Shahida Allahu annahu la ilaha illa huwa waalmalaikatu waoloo alAAilmi qaiman bialqisti la ilaha illa huwa alAAazeezu alhakeemu
Lit., "bears witness" - i.e., through the nature of His creation, which shows plainly that it has been brought into being by a consciously planning Power.
Allah Himself speaks to us through His revelations (through angels) and through His Creation, for all Nature glorifies Allah. No thinking mind, if it only judges the matter fairly, can fail to find the same witness in his own heart and conscience. All this points to the Unity of Allah, His exalted nature, and His wisdom.