Commentary
In verse 17 it is stated that Allah will decide among the believers and non-believers of different faiths on the Day of Resurrection, because He knows everything. What that decision would be, has been related in the Qur'an at several places, namely that the good Muslims will enjoy a life of everlasting peace and comfort, while the infidels would be condemned to a life of eternal perdition. In the next verse, by using the word "Sajdah" (prostration), it has been declared that all created things, be they living things, minerals or plants, are in obedience and thus submit to the Supreme authority of Allah Ta’ ala, thereby mentioning two groups of humans in this respect of 'submission'. One, which obeys Allah and therefore is included amongst the creatures who 'prostrate' to Him, and the other one which is rebellious and refuses to bow before Him, meaning, refusing to submit to His Will.
The word "Sajdah" (prostration) has been used here in the broader sense of 'submission' to the will of Allah and obeying His commands, because all created things act upon this submission in their own way. Human beings perform Sajdah by touching the ground with the forehead, while in the case of other created things their Sajdah constitutes their faithful performance of the functions assigned to them by Allah.
The truth about all created things obeying Allah
Genetically, the entire universe and all created things therein are under, the control and subject to the Will of their Creator by virtue of an inherently programmed guidance (guidance of Takwin) by Allah. The 'submission' in this sense is pre-determined, involuntary and instinctive. There is no created being which can escape this universal law of creation, be it a Muslim or a non-believer, a living thing or dead, mineral or plant. The smallest particle and the highest mountain cannot make the slightest movement without His Will. There is, however, another kind of submission to Allah, when a person offers homage to Him voluntarily and without constraint. This is what distinguishes a believer from a non-believer. A believer is obedient and sincere in his submission to Allah, whereas a non-believer repudiates His existence. As this verse deals with the difference between a Muslim and a kafir (infidel), it is more likely that reference to 'Sajdah' (prostration) does not refer to pre-destined and instinctive obedience alone but covers the voluntary submission as well.
Let it not be supposed that only human beings and Jinns who possess intelligence can offer voluntary and unconstrained submission, and animals, plants and minerals being devoid of reason cannot exercise voluntary and intentional obedience. Indeed it can be proved from the text of the Qur'an that every created thing has reason, intellect and intent, and the difference lies only in degree. Human beings and Jinns possess a perfect level of intelligence, which makes them liable to a strict adherence to the laws governing what is permissible and what is forbidden. As regards other creatures, Allah has given them intelligence according to their needs. Animals possess the highest degree of intelligence after humans, then come plants and last of all are the minerals. The intelligence among the animals can easily be perceived, and that possessed by plants can also be observed if one applies one's mind to the task.
However, the intelligence given to the minerals is so little and concealed that it is not easily discernible, though Allah has said clearly that they not only possess intelligence but also have the capacity to decide things. The Qur'an says about the sky and the earth قَالَتَا أَتَيْنَا طَائِعِينَ (They said, "We come willingly."41:11) that is, when Allah commanded the sky and the earth that they must submit to His Will either by their free choice or by force, they both replied that they accepted His authority by their own voluntary choice. At another place the Qur'an says وَإِنَّ مِنْهَا لَمَا يَهْبِطُ مِنْ خَشْيَةِ اللَّـهِ , (and there are still others which fall down in fear of Allah. - 2:74) which means that there are rocks, which fall down in fear of Allah Ta’ ala. Similarly, there are numerous traditions which provide evidence of mountains conversing with one another, or other created things showing signs of intelligence. Therefore, the homage mentioned in this verse for which the word Sajdah (Prostration) has been used means the voluntary homage.
The interpretation of this verse would, then, be that except for the human beings and Jinns all other created things voluntarily and willingly submit to the Divine Authority. It is only the human beings and Jinns who are divided into two factions, namely those who bow in submission to the Will of Allah, and those who deny His authority and refuse to submit to Him and are, therefore, despised. Allah knows best.
