Exodus 8:26

וַיֹּאמֶר פַּרְעֹה אָנֹכִי אֲשַׁלַּח אֶתְכֶם וּזְבַחְתֶּם לַיהוָה אֱלֹֽהֵיכֶם בַּמִּדְבָּר רַק הַרְחֵק לֹא־תַרְחִיקוּ לָלֶכֶת הַעְתִּירוּ בַּעֲדִֽי

And Pharaoh said: ‘I will let you go, that ye may sacrifice to the LORD your God in the wilderness; only ye shall not go very far away; entreat for me.’

וַיֹּאמֶר מֹשֶׁה הִנֵּה אָנֹכִי יוֹצֵא מֵֽעִמָּךְ וְהַעְתַּרְתִּי אֶל־יְהוָה וְסָר הֶעָרֹב מִפַּרְעֹה מֵעֲבָדָיו וּמֵעַמּוֹ מָחָר רַק אַל־יֹסֵף פַּרְעֹה הָתֵל לְבִלְתִּי שַׁלַּח אֶת־הָעָם לִזְבֹּחַ לַֽיהוָֽה

And Moses said: ‘Behold, I go out from thee, and I will entreat the LORD that the swarms of flies may depart from Pharaoh, from his servants, and from his people, tomorrow; only let not Pharaoh deal deceitfully any more in not letting the people go to sacrifice to the LORD.’

וַיַּעַשׂ יְהוָה כִּדְבַר מֹשֶׁה וַיָּסַר הֶעָרֹב מִפַּרְעֹה מֵעֲבָדָיו וּמֵעַמּוֹ לֹא נִשְׁאַר אֶחָֽד

And the LORD did according to the word of Moses; and He removed the swarms of flies from Pharaoh, from his servants, and from his people; there remained not one.

וַיַּכְבֵּד פַּרְעֹה אֶת־לִבּוֹ גַּם בַּפַּעַם הַזֹּאת וְלֹא שִׁלַּח אֶת־הָעָֽם

And Pharaoh hardened his heart this time also, and he did not let the people go.