[3:61] And whoever disputes with you concerning him…
It means that after you have revealed the truth of that which was said to you, and the knowledge of that which We spoke to you has been confirmed as true in your heart, do not be reticent in imposing the mutual cursing. Trust that you have the force (qahr) and help (nuṣra), and that We are guarding over you and have sheltered you in the wing of Our nearness. If they had sought this mutual cursing, the wadis would have burned them as raging fires, but God (s) gave them respite because of His knowledge of the believers [to come] in their loins.
The allusion in this verse is to one whose state has descended from the states of the sincere. When the lights [of the sincere] appear, what remains of the others fades away without a trace.