Reference for Eruvin 138:1

עד דהוי מומר לעבודת כוכבים

unless he is a mumar in respect of idolatry?<span class="x" onmousemove="('comment',' But not in respect of the Sabbath.');">¹</span> - R'Nahman B'Isaac replied: Only in respect of presenting or renouncing his right to his share,<span class="x" onmousemove="('comment',' Is an Israelite who desecrates the Sabbath regarded as a mumar.');">²</span> this being in agreement with what was taught: An Israelite mumar who observes the Sabbath in public<span class="x" onmousemove="('comment',' Lit., 'in the market place', though he desecrates it in private.');">³</span>

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