וַיֹּ֣אמֶר פַּרְעֹ֔ה הֵן־רַבִּ֥ים עַתָּ֖ה עַ֣ם הָאָ֑רֶץ וְהִשְׁבַּתֶּ֥ם אֹתָ֖ם מִסִּבְלֹתָֽם׃
At sinabi ni Faraon: “Narito, marami na ngayon ang mga tao sa lupain, at pinagpapahinga pa ninyo sila mula sa kanilang mga pasanin!”
Rashi
הן רבים עתה עם הארץ BEHOLD THE PEOPLE OF THE LAND NOW ARE MANY upon whom lies the duty of working, and you make them rest from their burdens — this is a great loss to us, since so many will refrain from work.
Sforno
הן רבים עתה עם הארץ, the really smart Hebrews would not listen to your words.
Or HaChaim
ויאמר פרעה הן רבים עתה עם הארץ, Pharaoh said: "now the people in the land are very numerous, etc." Pharaoh meant that in view of the large numbers of people involved it was impossible to convince all of them that they did not face a danger if they did not march to the desert to offer sacrifices to their G'd. This was why he held Moses and Aaron responsible for the work stoppage if it would occur. He directed this accusation exclusively at Moses and Aaron. Pharaoh meant that even a brief work stoppage was a major economic disaster considering the number of people involved.