GEN1471 R. Elazar said: If someone does a
mitzvah and does not finish it, and someone else comes and finishes it, he [the first] is brought down from his greatness, As it is written: ‘And it was at that time that Judah ‘went down from his brothers [having initiated Joseph’s rescue, but not having consummated it]’
Sotah 13b TEMIMAH-GEN 158
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