Reference for Kiddushin 79:19

לא קשיא הא דמצי כייף ליצריה והא דלא מצי כייף ליצריה

Intention which does not bear fruit the Holy One, blessed be He, does not combine with deed. Then what of the verse, that I may take the house of Israel in their own heart?<span class="x" onmousemove="('comment',' Ezek. XIV, 5. This shows that there is punishment for mere thought.');">³⁷</span> - Said R'Aha B'Jacob: That refers to idolatry, for a Master said: Idolatry is so heinous that he who rejects it is as though he admits [the truth of] the whole Torah.<span class="x" onmousemove="('comment',' Hence mere intention is punished.');">³⁸</span>

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