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We establish a nonlocal generalization of a well-known inequality by C. Fefferman and D. H. Phong $$\smallint _{\mathbb{R}^n } Vu^2 {\text{d}}x \leqslant C\smallint _{\mathbb{R}^n } \left| {Du} \right|^2 dx,$$ for u∈C0∞(ℝn) and V belonging to the Morrey space M with 1