Why does the famous and well known verse about polygyny starts by referring to orphans:
And if you fear that you will not deal justly with the orphan girls, then marry those that please you of [other] women, two or three or four. But if you fear that you will not be just, then [marry only] one or those your right hand possesses. That is more suitable that you may not incline [to injustice]. (4:3)
There must certainly be a reason why Allah started the verse referring to orphans. Does anybody can explain it?