وما تخفي صدورهم. ... وَمَا تُخْفِي صُدُورُهُمْ أَكْبَرُ...!

Take not into your intimacy those outside your ranks: They will not fail to corrupt you In their hearts they have even more hatred
They will not stop trying to harm you and ruin things for you, wanting what will hurt you and making things really difficult for you O you who have faith in Allah and follow His Prophet, do not take unbelievers as close friends, letting them know your secrets and private business

Allah has made clear to you what is in your interests in this world and in the Afterlife, if you use your intellect to understand what your Lord has revealed to you.

9
متن قرآن, سوره 3: آل عمران, آیه 111
We have certainly made the signs clear for you, should you exercise your reason
الموالاة: معناها ومظاهرها
Their hatred and hostility has appeared in what they say; in their criticism of your faith and worship, in incidents between you, and in them giving away your secrets
... وَمَا تُخْفِي صُدُورُهُمْ أَكْبَرُ...!
We have made plain to you the Signs, if ye have wisdom They only desire your ruin: Rank hatred has already appeared from their mouths: What their hearts conceal is far worse
do not take for intimate friends from among others than your own people; they do not fall short of inflicting loss upon you; they love what distresses you; vehement hatred has already appeared from out of their mouths, and what their breasts conceal is greater still; indeed, We have made the communications clear to you, if you will understand Hatred has already shown itself from their mouths, and what their breasts hide [within] is yet worse

Do not take your confidants from others than yourselves; they will spare nothing to ruin you.

2
وَمَا تُخْفِي صُدُورُهُمْ أَكْبَرُ ]..
They are eager to see you in distress
قد بدت البغضاء من أفواههم وما تخفي صدورهم أكبر !!
متن قرآن, سوره 3: آل عمران, آیه 111

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وَمَا تُخْفِي صُدُورُهُمْ أَكْبَرُ ]..
تفسير الآية (118
الموالاة: معناها ومظاهرها