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ʾin yathqafūkum yakūnū lakum ʾaʿdāʾan wa-yabsuṭū ʾilaykum ʾaydiyahum wa-ʾalsinatahum bi-s-sūʾi wa-waddū law takfurūna
If they were to confront you they would be your enemies, and would stretch out against you their hands and [unleash] their tongues with evil [intentions], and they are eager that you [too] should be faithless.
— Ali Quli Qarai
Surah al-Mumtahana - Verse 2
The Arabic root th-q-f denotes "to find, to confront," connoting that your enemies will not be satisfied unless you disbelieve. The blessed Verse is saying that how could believers befriend their enemies if wherever they find them, they will reveal their enmity through mistreating, slandering, and slaying them. Disbelievers intend that believers desist from believing and turn into disbelievers like them. In epistle 53 addressed to Malik Ashtar mentioned in Nahj al-Balagha, Hadhrat ‘Ali (as) says:
"Beware of the enemies' stratagems even after concluding the truce, since at times, the enemy approaches you to catch you by surprise."
In Ghurar al-Hikam, he also says:
"Do not feel secure from the enemy's harm even if he lauds you …"