וָאֲטַמֵּ֤א אוֹתָם֙ בְּמַתְּנוֹתָ֔ם בְּהַעֲבִ֖יר כָּל־פֶּ֣טֶר רָ֑חַם לְמַ֣עַן אֲשִׁמֵּ֔ם לְמַ֙עַן֙ אֲשֶׁ֣ר יֵֽדְע֔וּ אֲשֶׁ֖ר אֲנִ֥י יְהוָֽה׃ (ס)
At dinungisan ko sila sa pamamagitan ng kanilang mga handog, nang iparaan nila ang bawat panganay na nagbubukas ng sinapupunan, upang gawin ko silang wasak, upang malaman nila na Ako ang Walang-Hanggan.
Sforno
הקודש מן הבית, because of our and our fathers’ sins the privilege of performing Temple service was removed from the firstborn, who otherwise would also have been the recipients of all the various tithes. Ezekiel 20,26 refers to this when he writes: ואטמא אותם במתנותם, בהעביר כל פטר רחם , “and I defiled them through their own gifts, when causing each first born to pass;” the prophet calls this line the ווידוי מעשר, the confession represented by the fact that the tithe cannot remain in the home but must be given to Levites who supplanted the family priest, the firstborn as a result of their having participated in the sin of the golden calf. (Maasser Sheyni 5,10)
Rashi
that you bore for Me If one had five sons, four of them were devoted to worshipping idols, and one he would set aside to attend school; and when he comes to offer up one of his sons to Molech, he offers up to it this one whom he had set aside to study Torah in the Midrash of Rabbi Tanchuma. But I say that “that you bore for Me” refers to the firstborn. Likewise, it is stated in this Book (20:26): “And I defiled them with their gifts, when they caused every one who opened the womb to pass.”