Now the positioning of the parts of the phrases:

As shown above, by reason of the necessary relationship between two sentences joined by a conjunction, the [conjunction] "And" [at the beginning of] "Behold (lit. And then), your Lord and Sustainer said to the angels: I will create a vicegerent on earth (wa idh qâla rabbuka li'l-malâ'ika innî jâ'ilun fi'l-ard khalîfatan)" implies an unstated sentence. An implied sentence is similarly required before the verse "Behold! Your Lord said to the angels: I am about to create man from sounding clay... (Wa idh

qâla Rabbuka...)"( 15:28)

Also, since [by its very nature] Revelation summons attention and calls to mind, the conjuction "And" implies 'And recall to them that when your Lord..."

The [particle] "then (idh)" denotes past time, and so sends the minds [of listeners] down the rungs of the past, there raises [the veil] and attracts to the present its events so they may behold them and gather them up.

The [words] "Your Lord and Sustainer (Rabbuka)" is a proof for the angels; that is, the One who has raised and perfected you [Muhammad], and made you the guide of humankind that you might put a stop to their corruption. That is, you are the supreme good deed [of mankind] that preponderates over all its iniquities and covers its faults.

"To the angels (li'l-malâ'ika):" through their conversation in the form of consultation this indicates that the dwellers of the heavens, that is, the angels, have very many relations and connections with the dwellers of the earth, that is, humankind. For some of them are charged with overseeing [human beings] (muwakkal), some are guardian angels, some are recording angels, so they have to concern themselves with their affairs.

Since it is the nature of the [intensifying particle] "inna" to repulse doubts, here expressed [by the angels' question] "will You place... ? (a taj'alu)," it indicates the immense importance of the question.