Faith ... just like US.
Faith in God. Faith that God would save you.
This is POST MOSES in your example, so you have THIS story to teach you:
Numbers 21:4-9 [NLT]
Then the people of Israel set out from Mount Hor, taking the road to the Red Sea to go around the land of Edom. But the people grew impatient with the long journey, and they began to speak against God and Moses. "Why have you brought us out of Egypt to die here in the wilderness?" they complained. "There is nothing to eat here and nothing to drink. And we hate this horrible manna!"
So the LORD sent poisonous snakes among the people, and many were bitten and died. Then the people came to Moses and cried out, "We have sinned by speaking against the LORD and against you. Pray that the LORD will take away the snakes." So Moses prayed for the people.
Then the LORD told him, "Make a replica of a poisonous snake and attach it to a pole. All who are bitten will live if they simply look at it!" So Moses made a snake out of bronze and attached it to a pole. Then anyone who was bitten by a snake could look at the bronze snake and be healed!
Just as a point of interest, Jesus mentioned that THIS was EXACTLY how Jesus would save ...
John 3:14-18 [NLT]
And as Moses lifted up the bronze snake on a pole in the wilderness, so the Son of Man must be lifted up, so that everyone who believes in him will have eternal life.
"For God loved the world so much that he gave his one and only Son, so that everyone who believes in him will not perish but have eternal life. God sent his Son into the world not to judge the world, but to save the world through him.
"There is no judgment against anyone who believes in him. But anyone who does not believe in him has already been judged for not believing in God's one and only Son.
If you are lucky, a Rabbi can explain some of the symbolism that Nicodemus (a Teacher of Teachers) would have known and most Jewish people that had memorized EVERY WORD of the 5 books by Moses would have known ...
- SNAKE - remember back in the story of Adam and Eve, the snake always symbolizes "evil" or "sin".
- BRONZE - If you go through the detailed description of how to build the Tabernacle and the Offerings, BRONZE is the metal associated with the Sin Offering and the Judgement of God.
- POLE - "Cursed is everyone that hangs on a pole" - they knew that verse.
So let's put that together for what God commanded Moses to create: a snake, made of bronze, hanging on a pole. That would be "Evil/Sin", "Judged/Offering" and "Cursed" ... In other words, GOD had already passed judgement on their sin (rather than them) and cursed SIN/EVIL itself rather than the sinner.
Now let's go back to the story in Numbers 21 and see what was going on.
- The people (the whole nation) had SINNED.
- God had already passed JUDGEMENT on the WHOLE NATION and issued a death sentence to EVERYONE.
- Poison Snakes were in the process of carrying out that sentence and executing the GUILTY.
- God offered "SALVATION" (a way for people who sinned and were already as good as dead to LIVE). How?
- You had to LOOK at (or just in the general direction of) "SIN JUDGED AND CURSED" and trust that God would save you ... for no reason other than BECAUSE you trusted in Him.
Fast Forward to ... let's say the time of King David [you were not specific]. The pole and bronze snake and the poison snakes are all LONG GONE. Unfortunately, you and I are still sinners. God says that if you TRUST in God and kill a Lamb in place of your sin, God will forgive you. The LAMB did no more to UNDO the sin we did than the BRONZE SNAKE undid what they did. The only thing that really counts (and makes any sense) is the TRUST IN GOD is exactly the same!
Let's fast forward again, to AD 33 (ish) and Jesus talking with "Nick" about Moses' snake and "For God so loved the world" and the rest of the John 3 stuff. We STILL sin. [sigh] Now God came IN PERSON to tell us "TRUST IN ME" and you will live. I am the Bronze. The Snake (sin) will be judged and condemned and placed on me and I will be lifted up on that Pole. However GOD cannot be cursed, so it is OUR SIN that will be cursed. Death will die and God will prevail and ALL WHO TRUST IN HIM will live (not just a day, but forever).
The Bronze Snake on a Pole was to teach us about TRUST AND LIVE and point forward to Christ. The Lamb on the fire in the temple was to teach us about TRUST AND LIVE and point forward to Christ. Christ came as the lamb of God and condemned sin on a cross and said "IT IS FINISHED". So we could finally trust in what God had been calling us to trust in from the beginning ... HIMSELF!
I hope that helps.