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Sc., "and therefore one of the enemies". This verse prohibits the treating of noncombatants as enemies and using their supposed unbelief as a pretext for plundering them. The injunction "use your discernment" (tabayyanu) imposes on the believers the duty of making sure, in every case, whether the persons concerned are actively engaged in hostilities or not.
Lit., "thus have you [too] been aforetime". Since the preceding injunction refers to the whole community, it would seem that the above clause, too, bears the same implication: namely, a reference to the time when the Muslim community was, because of its weakness and numerical insignificance, at the mercy of enemies endowed with greater power. Thus, the believers are told, as it were: "Remember your erstwhile weakness, and treat the peacefully-minded among your enemies with the same consideration with which you yourselves were once hoping to be treated."
i.e., spoils of war.
Go abroad: dharaba = to travel, to go for jihad, or for honest trade or other service, which if done with pure motives, counts as service in the cause of Allah. The immediate occasion was in connection with jihad, but the words are general, and can be applied to similar circumstances. In war (or in peace) we are apt to catch some worldly advantage by pluming ourselves on our superiority in Faith. In war perhaps we want to gain glory or booty by killing a supposed enemy. This is wrong. The righteous man, if he is really out in Allah's service, has more abundant and richer gifts to think of in the Hereafter.