Quran (41:34-36) – “Good and evil are not alike. Repel their evil with goodness from you and you will see that your enemy will become your dearest friend…if an evil whisper from shaitan tries to turn you away (from turning enemies into friends), then seek refuge in Allah…”
Allah commands ending of enmity. The above formula will always work otherwise Allah’s word will be proven wrong.
Shaitan and his followers will give Muslims reasons to not trust the above formula of Allah. Seek refuge in Allah’s guarantee rather than the fears that shaitan plants in your hearts, if indeed you are true Muslims.