Surah 8. Al-Anfal, Ayah 12

The phrase "I am with you" is addressed (through the angels) to the believers - "for, the purport of these words was the removal of fear, since it was the Muslims, and not the angels, who feared the deniers of the truth" (Razi).

The following is, again, addressed to the believers (Razi). {Verse 10} of this surah makes it clear that the aid of the angels was purely spiritual in nature; and there is no evidence anywhere in the Qur'an that they did, or were meant to, participate in the battle in a physical sense. In his commentary on the above verse, Razi stresses this point repeatedly; among modern commentators, Rashid Rida' emphatically rejects the legendary notion that angels actually fought in this or any other of the Prophet's battles (see Manar IX, 612 ff.). It is mainly on the basis of Razi's interpretation of this passage that I have interpolated, in several places, explanatory clauses between brackets.

I.e., "destroy them utterly".

The vulnerable parts of an armed man are above the neck. A blow on the neck, face or head, finishes him off. If he has armour it is difficult to get at his heart. But if his hands are put out of action, he is unable to wield his sword or lance or other weapon, and easily becomes a prisoner.