וַיִּקְרָ֣א פַרְעֹ֔ה אֶל־מֹשֶׁ֖ה וּֽלְאַהֲרֹ֑ן וַיֹּ֗אמֶר לְכ֛וּ זִבְח֥וּ לֵֽאלֹהֵיכֶ֖ם בָּאָֽרֶץ׃
I wezwał Faraon Mojżesza i Ahrona i rzekł: "Idźcie, ofiarujcie Bogu waszemu w tym kraju."
Rashi
זבחו לאלהיכם בארץ SACRIFICE TO YOUR GOD IN THE LAND, in the place where you are, and do not go into the wilderness.
Chizkuni
זבחו לאלוקיכם בארץ, “offer meat offerings to your G-d inside the land of Egypt!” When Pharaoh saw that G-d made clear distinctions between where the plagues that occurred where the Israelites lived and where not, he made the first concession allowing them to offer sacrifices inside Egypt so that their G-d would not punish them.
Siftei Chakhamim
Where you are, and do not go into the wilderness. Rashi is answering the question: [Since בארץ implies anywhere on earth, what is Pharaoh saying?] Would they sacrifice in heaven? Therefore Rashi explains: “Do not go into the wilderness,” for they had requested to go into the wilderness to sacrifice to Hashem.