Prostration was never a symbol of worship at the time of creation.
This element was added to it with the passage of time. Thenceforth, it
became peculiar to God and prohibited for other creatures.
Moreover, Allah had ordered the angels to bow down before Adam, not for his
respect, but for the test and trial of creatures which were present at that
time. In this test, Satan failed, whereas others passed. God may adopt any
way for the trial of His creatures. It may be general in nature or can be
peculiar to time or personalities. Such peculiarity will limit the matter to
certain periods of history or to certain persons, and hence cannot be argued
for as a precedent. The story of Adam and Satan is of the same nature.