Not too unbelievable— unless you want to be unbelieving.
You’re right about the wording in Moses’ writing being the “EXACT SAME” wording. The Septuagint translation of Moses ALSO says, “Let him die” and not “Put him to death.” So that justifies my position as to what God had actually said according to the words of Jesus.
However, it doesn’t follow that because Moses correctly stated what God had said IN THIS INSTANCE, that Moses was ALWAYS CORRECT when he talked to the Israelites about what God said or commanded.
Notice that Jesus never quoted Moses in Deut 20:17 stating that THE LORD commanded the complete destruction of the Hittites and the Amorites, the Canaanites and the Perizzites, the Hivites and the Jebusites,
Nor did Jesus ever quote the words in I Chronicles 13:9,10 where the LORD supposedly struck Uzzah dead for steadying the Ark when the oxen stumbled.
Nor did Jesus ever quote the words of 1 Sam 6:19 where the LORD supposedly killed 70 men of Beth-shemesh for looking at the ark of the covenant:
And he (the LORD) struck some of the men of Beth-shemesh, because they looked upon the ark of the LORD. He struck seventy men of them, and the people mourned because the LORD had struck the people with a great blow.
Nor did Jesus EVER quote words from the OT that affirmed that God EVER killed people. Jesus was the exact image of the Father’s essence (Heb 1:3), and HE never killed anyone or commanded His disciples to kill anyone. If we want to know the character of God, we need only to study the character of Jesus. Jesus was Another EXACTLY like the Father. He revealed the FATHER as He TRULY IS!