Parashas Shemos
וַתֵּ֤רֶד בַּת־פַּרְעֹה֙ לִרְחֹ֣ץ עַל־הַיְאֹ֔ר וְנַעֲרֹתֶ֥יהָ הֹלְכֹ֖ת עַל־יַ֣ד הַיְאֹ֑ר וַתֵּ֤רֶא אֶת־הַתֵּבָה֙ בְּת֣וֹךְ הַסּ֔וּף וַתִּשְׁלַ֥ח אֶת־אֲמָתָ֖הּ וַתִּקָּחֶֽהָ׃
The daughter of Pharaoh came down to bathe in the Nile, while her maidens walked along the Nile. She spied the basket among the reeds and sent her handmaid to fetch it.
Torah Temimah points to R’ Yochanan — Sotah 12b (verified).
ונערותיה הולכות — א״ר יוחנן: אין הליכה זו אלא לשון מיתה.
English: “And her maidens were walking” — R’ Yochanan said: This “walking” is nothing other than a language of death.
Custom
The maidens who opposed the rescue were struck down; the verse’s “walking” is read as their death.