Num 21:8-9, Rom 5:8, 1 Jn 4:9
In the Old Testament, God made those who were bitten by serpents live when they saw the bronze serpent on Moses' pole. This prophesied that Christ would die on the cross for us in order to save us in the future. (Num 21:8-9)
Num 21:8 And the Lord said unto Moses, Make thee a fiery serpent, and set it upon a pole: and it shall come to pass, that every one that is bitten, when he looketh upon it, shall live. 9 And Moses made a serpent of brass, and put it upon a pole, and it came to pass, that if a serpent had bitten any man, when he beheld the serpent of brass, he lived.
As the Christ, Jesus died on the cross to save us. (Jn 3:14-16)
Jn 3:14 And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up: 15 That whosoever believeth in him should not perish, but have eternal life. 16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
God loved us so much that He sent His only begotten Son to die on the cross. (Rom 5:8, 1 Jn 4:9)
Rom 5:8 But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.
1 Jn 4:9 In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him.