Esther 9:15
For the Jews that were in Shushan gathered themselves together on the fourteenth day also of the month Adar, and slew three hundred men at Shushan; but on the prey they laid not their hand.
Cross-reference
Esther 9:2 describes the general Jewish gathering and victory; verse 15 specifies the Susa execution of 300 men on the 14th as part of that.
Esther 9:10 earlier records the same refusal to take plunder after killing Haman's sons, reinforcing this deliberate restraint.
Esther 9:13 is Esther's request for an extra day and hanging of sons; verse 15 records the extra day's killings in Susa as a result.
Esther 9:16 describes the Jews in the provinces also refusing plunder after killing 75,000 — a parallel restatement of their integrity.
Esther 9:18 explains that Susa's Jews fought on both the 13th and 14th, leading to a two-day feast — contextual continuation of the narrative.
Esther 8:11 grants the right to kill enemies; verse 15 shows the Jews exercising that right in Susa on the 14th day.
Genesis 14:23 has Abram refusing spoils from the king of Sodom — a direct moral parallel of not taking plunder from battle.