You have been rebellious: this verbal phrase in Hebrew is from the same root as the verb rebelled in verse 23. Another way of saying this is “In fact, you have refused to obey Yahweh ever since….”

From the day I knew you: this presumably means from the time Moses led the Israelites out of Egypt, forty years before. There is some textual evidence that the Hebrew text should be “he knew you,” referring to God. It could be that this was seen as a criticism of God for not knowing beforehand how the Israelites would act, so that the text was changed in transmission. The Hebrew Old Testament Text Project committee prefers “he knew you,” as do Contemporary English Version, New Revised Standard Version, Revised English Bible, and New Jerusalem Bible; and a translator should feel free to translate it in this way.

Quoted with permission from Bratcher, Robert G. and Hatton, Howard A. A Handbook on Deuteronomy. (UBS Helps for Translators). New York: UBS, 2000. For this and other handbooks for translators see here .