Reference for Sanhedrin 205:1

בגלל מנשה דלא עבד תשובה

'because of Manasseh' — who did not repent. R. Johanan said: He who asserts that Manasseh has no portion in the world to come weakens the hands of penitent sinners. For a tanna recited before R. Johanan: Manasseh was penitent for thirty-three years, as it is written, Manasseh was twelve years old when he began to reign, and reigned fifty and five years in Jerusalem, and he made a grove, as did Ahab king of Israel. How long did Ahab reign? Twenty-two years. How long did Manasseh reign? Fifty-five years. Subtract therefrom twenty-two, which leaves thirty-three.<span class="x" onmousemove="('comment',' It is assumed that the verse implies that their sinning and their punishment was equal. ');">¹</span>

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