Reference for Psalms 78:44

וַיַּהֲפֹ֣ךְ לְ֭דָם יְאֹרֵיהֶ֑ם וְ֝נֹזְלֵיהֶ֗ם בַּל־יִשְׁתָּיֽוּן׃

And turned their rivers into blood, So that they could not drink their streams.