וַיֹּ֥אמֶר יְהוָ֖ה אֶל־מֹשֶׁ֑ה עַד־אָ֙נָה֙ מֵֽאַנְתֶּ֔ם לִשְׁמֹ֥ר מִצְוֺתַ֖י וְתוֹרֹתָֽי׃
And the LORD said unto Moses: ‘How long refuse ye to keep My commandments and My laws?
Read kabbalistic (mystical) interpretation of Exodus 16:28: and classical mystical sources.