אֶל־הֶֽהָרִים֙ לֹ֣א אָכָ֔ל וְעֵינָיו֙ לֹ֣א נָשָׂ֔א אֶל־גִּלּוּלֵ֖י בֵּ֣ית יִשְׂרָאֵ֑ל וְאֶת־אֵ֤שֶׁת רֵעֵ֙הוּ֙ לֹ֣א טִמֵּ֔א וְאֶל־אִשָּׁ֥ה נִדָּ֖ה לֹ֥א יִקְרָֽב׃
and hath not eaten upon the mountains, neither hath lifted up his eyes to the idols of the house of Israel, neither hath defiled his neighbour’s wife, neither hath come near to a woman in her impurity;
Mesilat Yesharim
For it is not only the explicit and well known deed of theft or oppression which is forbidden but rather anything which may eventually lead to such a deed and cause it is included in the prohibition. On this our sages of blessed memory said (Sanhedrin 81a): "'he did not defile the wife of his fellow' (Yechezkel 18:6) - that he did not encroach upon his fellow's trade".