Reference for Gittin 72:5

איבעיא להו כי התקין הלל פרוסבול לדריה הוא דתקין או דלמא לדרי עלמא נמי תקין

For R. Isaac has said: How do we know that the Rabbis have power to expropriate? Because it says, And that whosoever came not within three days according to the counsel of the princes and the elders, all his substance should be forfeited, and himself separated from the congregation of the captivity.<span class="x" onmousemove="('comment',' Ezra, X, 8. ');">⁵</span>

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