Or HaChaim on Exodus 10:25/אור החיים על שמות י׳:כ״ה

1 גם אתה תתן בידנו זבחים, "you too will give into our hands meat-offerings, etc." It is somewhat difficult to understand why a servant of the only G'd should ask a confirmed sinner such as Pharaoh who had repeatedly raised his voice against G'd to offer his animals to the G'd of the Hebrews as sacrifices on his behalf. Do we not know that G'd hates the offerings of sinners? While it is true that we learned in Chulin 13 that the words איש איש in Leviticus 22,18 are the basis for our ruling that G'd accepts sacrifices from Gentiles, this certainly does not mean that a Jew should request a Gentile to offer such offerings!

2A close look at our verse will show you that Moses did not request such offerings. He had only said ועשינו לה׳ אלוקינו. Moses predicted that Pharaoh would voluntarily give the Jews animals which would be suitable as offerings to G'd and that the Israelites would use these animals for such a purpose on their own behalf. The animals were to be viewed as gifts from Pharaoh to the Jewish people to enable them to have enough animals for their requirements. We have proof of what Moses had in mind because we are taught in Menachot 63 that the only sacrifices accepted from Gentiles are total offerings, as opposed to peace offerings. Since Moses spoke also about זבחים i.e. peace-offerings, it is clear that he did not mean to offer these animals on behalf of Pharaoh.