This world is Allah’s creation. This creation has three stages- i. Kalma-e-ilahi, ii. Amr-e-ilahi, iii. Ayat-e-ilahi.
Kalma-e-ilahi is the first stage in the process of creation. Allah says
“For to anything which We have willed, We but say the word, "Be", and it is” (al-nahl-40).
The word “ kun” used in this verse is kalma-e-ilahi; whenever Allah wants anything to happen, He utters this ‘kalma’ and consequently that thing happens. In Quran, we find many verses in this regard.
“Indeed, the example of Jesus to Allah is like that of Adam. He created Him from dust; then He said to him, "Be," and he was” (al-imran-59).
It is our common observation that whatever happens in this world, it is happened through a natural system; in other words, kalma-e-ilahi always operates through a natural system. In Quran word ‘amr’ is used to denote natural system.
“His ‘amr’, when He intends anything, that He says to it: Be, so it is” (Yasin-82).
From this above verse, it is evident that when Allah intends about anything, He decrees a relevant natural system (amr) through which that thing happens.
Quran mentions about decree of ‘amr’/ natural system in some other verses too. “Originator of the heavens and the earth. When He decrees a ‘amr’, He only says to it, "Be," and it is” (al-baqra-117).
“She said, "My Lord, how will I have a child when no man has touched me?" [The angel] said, "Such is Allah ; He creates what He wills. When He decrees a ‘amr’, He only says to it, 'Be,' and it is” (al-imran-47).
Briefly speaking, in the process of creation, kalma-e-ilahi is the first stage; at this stage word ‘kun’ is uttered by Allah regarding a thing to happen. At the second stage, natural law/ ‘amr’ is created through which that thing is to happen. At the third stage, the required thing actually comes into being; in other words, it is created. When a thing is created, it is called ‘ayat-e-ilahi.