וַתֹּאמֶר֩ יִזְכָּר־נָ֨א הַמֶּ֜לֶךְ אֶת־יְהוָ֣ה אֱלֹהֶ֗יךָ מהרבית [מֵהַרְבַּ֞ת] גֹּאֵ֤ל הַדָּם֙ לְשַׁחֵ֔ת וְלֹ֥א יַשְׁמִ֖ידוּ אֶת־בְּנִ֑י וַיֹּ֙אמֶר֙ חַי־יְהוָ֔ה אִם־יִפֹּ֛ל מִשַּׂעֲרַ֥ת בְּנֵ֖ךְ אָֽרְצָה׃
婦人說：「願王記念永恆者你的上帝，不要讓報血仇的人再多行殺害，免得他們除滅我的兒子。」王說：「我指著永活的永恆者起誓，你兒子連一根頭髮也不會落在地上。」
Rashi
Please remember Adonoy. God was stringent concerning the distance [necessary] to save lives2When a person kills accidently, he must go to a city of refuge. These cities should never be too distant from any potential fugitive who may need to go there. as it is said, "He will overtake him because the way was long".3Devorim 19:5. This is [her reference with], "To avoid giving more [time] for the avenger to destroy," and you are pushing me [away].