Reference for Makkot 10:9

אמרו להם חכמים והלא כבר נאמר (דברים יט, יט) ועשיתם לו כאשר זמם לעשות לאחיו והרי אחיו קיים ואם כן למה נאמר נפש תחת נפש יכול משעה שקבלו עדותן יהרגו תלמוד לומר נפש תחת נפש הא אינן נהרגין עד שיגמר הדין:

The Sages said to them, But the Torah already says (Deuteronomy 19, 19), "And you should do to them [the zomemim] as they had plotted to do to their brother", which would imply that their brother [the victim] is still alive. If so then why does [the Torah] say, "a soul for a soul"? You might think that they [the zomemim] would be liable to be killed from the time that their testimony was accepted, Therefore the Torah says "a soul for a soul" to teach us that they [zomemim] aren't executed until they succeeded in having a verdict [for their victim].

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