Exodus 5:1-3

WEB_Strongs(i)
  1 H310 Afterward H4872 Moses H175 and Aaron H3843 came, H559 and said H6547 to Pharaoh, H3068 "This is what Yahweh, H430 the God H1639 of Israel, H559 says, H5971 ‘Let my people H7971 go, H7503 that they H559 may hold a feast H4057 to me in the wilderness.'"
  2 H6547 Pharaoh H559 said, H3068 "Who is Yahweh, H8085 that I should listen H6963 to his voice H3478 to let Israel H7971 go? H3045 I don't know H3068 Yahweh, H3478 and moreover I will not let Israel H7971 go."
  3 H559 They said, H430 "The God H5680 of the Hebrews H7122 has met H3212 with us. Please let us go H7969 three H3117 days' H1870 journey H4057 into the wilderness, H2076 and sacrifice H3068 to Yahweh, H430 our God, H6293 lest he fall H1698 on us with pestilence, H2719 or with the sword."