וַיֹּ֤אמֶר יְהוָה֙ אֶל־מֹשֶׁ֔ה מַה־תִּצְעַ֖ק אֵלָ֑י דַּבֵּ֥ר אֶל־בְּנֵי־יִשְׂרָאֵ֖ל וְיִסָּֽעוּ׃
And the LORD said unto Moses: ‘Wherefore criest thou unto Me? speak unto the children of Israel, that they go forward.
Read halakhic rulings (Jewish law) on Exodus 14:15: and classical halakhic sources.