Halakhah for Kiddushin 79:13
מחשבה רעה אין הקדוש ברוך הוא מצרפה למעשה שנאמר (תהלים סו, יח) און אם ראיתי בלבי לא ישמע ה' ואלא מה אני מקים (ירמיהו ו, יט) הנני מביא אל העם הזה רעה פרי מחשבותם מחשבה שעושה פרי הקב"ה מצרפה למעשה מחשבה שאין בה פרי אין הקב"ה מצרפה למעשה
Similarly you read: Woe unto the wicked [man] [that is] evil; for the reward of his hands shall be given unto him:<span class="x" onmousemove="('comment',' Ibid. 11.');"><sup>22</sup></span> is there then a wicked man that is evil and one that is not evil? But he that is evil to Heaven and evil to man, he is a wicked man that is evil; he who is evil to Heaven but not evil to man, he is a wicked man that is not evil.
Sefer HaChinukh
The laws of the commandment and its details are elucidated in many scattered places in the Gemara, such that they, may their memory be blessed, warned us about it, not to ponder thoughts of idolatry (i.e. Berakhot 12b); and they, may their memory be blessed, said that it is not only the thought of idolatry that is forbidden, but rather any thought that causes a person to uproot something from the Torah. And Scripture prohibited this explicitly, as it is written (Numbers 15:39), "and you shall not stray after your hearts." And they may their memories be blessed, said (Kiddushin 40a) that for Israel, the Holy One, blessed be He, does not consider a thought of sin to be like the act - except for the thought of idolatry, which is considered for a man to be like the act (see Mishneh Torah, Laws of Foreign Worship and Customs of the Nations 2).
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