What does it mean to “have knowledge of good and evil”?
‘And your little ones and your children, who you say are for a prey, who today have no knowledge of good and evil, they are going in there. And to them I give it, and they are to possess it.
(Deuteronomy 1:39 The Scriptures 1998+)
"Have NO knowledge of good and evil."
Let Scripture define Scripture and use the first occurrence of a word/phrase set the definition.
And out of the ground יהוה Elohim made every tree grow that is pleasant to the sight and good for food, with the tree of life in the midst of the garden and the tree of the knowledge of good and evil.
(Genesis 2:9 The Scriptures 1998+)
And יהוה Elohim commanded the man, saying, “Eat of every tree of the garden, but do not eat of the tree of the knowledge of good and evil, for in the day that you eat of it you shall certainly die.”
(Genesis 2:16-17 The Scriptures 1998+)
When Adam and Chavah ate of the wrong tree, they HAD knowledge of good and evil. By choice, they allowed a physical metamorphosis to transpire after a spiritual action had culminated in physical transgression of YHWH's commands.
These children in Debarim 1:39 had NO knowledge of good and evil.
“Learn to do good! Seek right-ruling, reprove the oppressor, defend the fatherless, plead for the widow. “Come now, and let us reason together,” says יהוה. “Though your sins are like scarlet, they shall be as white as snow; though they are red like crimson, they shall be as wool. “If you submit and obey, you shall eat the good of the land; but if you refuse and rebel, you shall be devoured by the sword,” for the mouth of יהוה has spoken.
(Isaiah 1:17-20 The Scriptures 1998+)
Submit and obey and you shall eat the good of the land.
So we can see that having knowledge of good and evil ties into being unrighteous or living in sin (transgression of the Torah). Only those who submit and obey are worthy to enter the Land.
How do we who are born into sin become un-knowledgeable of good and evil? The Blood of Y’shua was shed so we can be covered and become (metamorphosis) into righteous children.