Reference for Chullin 156:20

אביו שלא אמו ואמו שלא אביו מנין

that is, he has cursed his father, he has cursed his mother:<span class="x" onmousemove="('comment',' For at the beginning of the verse: 'that curseth' is in immediate proximity to 'his father', and at the end of the verse: 'he hath cursed' is in immediate proximity to 'his mother'; thus showing that he who curses either parent is liable.');">⁹</span>

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