﴿ وَلَوْ نَشَآءُ لَأَرَيْنَٰكَهُمْ فَلَعَرَفْتَهُم بِسِيمَٰهُمْ ۚ وَلَتَعْرِفَنَّهُمْ فِى لَحْنِ ٱلْقَوْلِ ۚ وَٱللَّهُ يَعْلَمُ أَعْمَٰلَكُمْ ﴾

“Now had We so willed, We could have shown them clearly to thee, so that thou wouldst know them for sure as by a visible mark: but [even so,] thou wilt most certainly recognize them by the tone of their voice. And God knows all that you do, [O men;]”

And if We will We could show them to you We could have pointed them out to you the lām is repeated in the following fa-la-‘araftahum then you would recognise them by their mark. And you will certainly recognise them wa-la-ta‘rifannahum the wāw is for an omitted oath and what follows it fī lahni’l-qawl is its response by their tone of speech that is to say by the meaning thereof when they speak in your presence alluding as they do to what amounts to a scathing attack upon the Muslims; and God knows your deeds.