Reference for Kiddushin 34:17

אלא מדרבנן גזירה הוא דעבוד רבנן שמא יחזור לסורו תניא נמי הכי במה דברים אמורים כשירשו אבל כשנשתתפו אסור

Whence do we know it of one who is sold to a heathen? - Said Hezekiah, because Scripture writes, And he shall reckon with his purchaser<span class="x" onmousemove="('comment',' Lev. XXV,50; the verse treats of redeeming a Jewish slave from a heathen owner.');">²²</span> - but not with his purchaser's heirs. Raba said: By Biblical law, a heathen is his father's heir, for it is said: 'and he shall reckon with his purchaser', [implying,] but not with his purchaser's heirs, whence it follows that he has heirs.

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