The serpent said to the woman in Genesis 3:
The serpent's prediction was confirmed some verses later:
Let's see the context, Genesis 3:
Did Satan tell the truth in Genesis 3:5?
No, he did not tell the whole truth. A better and deeper question is this: Was Satan a liar when he talked to Eve in Genesis 3?
Whatever partial truths Satan says at any time, he intends to deceive. He is a liar from the beginning to the end, through and through.
Did the serpent lie?5 “For God knows that when you eat from it your eyes will be opened, and you will be like God, knowing good and evil.”
The serpent's prediction was confirmed some verses later:
Did the serpent actually lie by saying man will become godlike after eating the fruit?22 And the Lord God said, “The man has now become like one of us, knowing good and evil. He must not be allowed to reach out his hand and take also from the tree of life and eat, and live forever.”
Let's see the context, Genesis 3:
This directly contradicts Genesis 2:4 “You will not certainly die,” the serpent said to the woman.
Satan directly and formally contradicts the words of God in Genesis 3:4. So Jesus was correct when he said in John 8:17 but you must not eat from the tree of the knowledge of good and evil, for when you eat from it you will certainly die.”
Now, what about Genesis 3:88 You belong to your father, the devil, and you want to carry out your father’s desires. He was a murderer from the beginning, not holding to the truth, for there is no truth in him. When he lies, he speaks his native language, for he is a liar and the father of lies.
I'd interpret this according to the words of Jesus. According to Jesus, a lie was not just the outward words that Satan uttered. It included Satan's intention from the inside of him, from his heart if you will. He intended to get Eve to disobey God's words and rebel. It is his natural practice to lie because he is by character a liar. Liar is who he is, and lying is what he does naturally.5 For God knows that when you eat from it your eyes will be opened, and you will be like God, knowing good and evil.
Did Satan tell the truth in Genesis 3:5?
No, he did not tell the whole truth. A better and deeper question is this: Was Satan a liar when he talked to Eve in Genesis 3?
Whatever partial truths Satan says at any time, he intends to deceive. He is a liar from the beginning to the end, through and through.