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إِذَا رَأَى أَحَدُكُم مِنْ أَخِيهِ, أَوْ مِنْ نَفْسِهِ, أَوْ مِنْ مَالِهِ مَا يُعْجِبُهُ [فَلْيَدْعُ لَهُ بِالْبَرَكَةِ] فَإِنَّ الْعَيْنَ حَقٌّ
If you see anything of your brother that pleases you, or of his person or of his property [then ask Allah to bless him in it] for the envious eye is real.
Source: Ahmad 4/447, Ibn Majah, Malik.