Numbers 25:8

אל הקבה means TO THE TENT. אל קבתה means IN HER STOMACH, similar to (Deut 18:3): “And the two cheeks and the maw (והקיבה)”. He miraculously struck exactly at Zimri’s male and her female parts so that everyone could plainly perceive that he had not killed them without just cause. Many other miracles, too, were wrought for him, as is related there (Sanhedrin 82b).

וַ֠יָּבֹ֠א אַחַ֨ר אִֽישׁ־יִשְׂרָאֵ֜ל אֶל־הַקֻּבָּ֗ה וַיִּדְקֹר֙ אֶת־שְׁנֵיהֶ֔ם אֵ֚ת אִ֣ישׁ יִשְׂרָאֵ֔ל וְאֶת־הָאִשָּׁ֖ה אֶל־קֳבָתָ֑הּ וַתֵּֽעָצַר֙ הַמַּגֵּפָ֔ה מֵעַ֖ל בְּנֵ֥י יִשְׂרָאֵֽל׃

and he went after the man of Yisra᾽el into the chamber, and thrust both of them through, the man of Yisra᾽el, and the woman through her belly. So the plague was stayed from the children of Yisra᾽el.