شَهِدَ اللَّهُ أَنَّهُ لَا إِلٰهَ إِلَّا هُوَ وَالْمَلَائِكَةُ وَأُولُو الْعِلْمِ قَائِمًا بِالْقِسْطِ.
Allah bears witness that there is no deity but Him, as do the angels and those possessing knowledge; He upholds justice. (Āl ʿImrān 3:18)
The testimony establishes Allah as the only true deity. The angels and people of knowledge bear witness to this same reality.
Qāʾiman bil-qisṭ describes His upholding justice.