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I.e., "thou shalt have no real power over them", as brought out in 14:22 and 15:42 .
As Evil has no authority over the sincere servants of Allah, they should put their trust completely in Him. For He is All-Sufficient to carry out their affairs, and by His grace, to save them from all harm and danger.
This verse should be read along with the two preceding ones to complete their meaning. Evil has no power except over those who yield to its solicitations.