John 3:16 is just part of the story.
Phillipians 2:6-8
who, although He existed in the form of God, did not regard equality with God a thing to be grasped, but emptied Himself, taking the form of a bond-servant, and being made in the likeness of men. And being found in appearance as a man, He humbled Himself by becoming obedient to the point of death, even death on a cross.
Romans 5:8-9
but Yahweh demonstrates His own love toward us, in that while we were still sinners, Messiah died for us. Much more then, having now been justified by His blood, we shall be saved from wrath through Him.
Isaiah 53:10
Yet it pleased Yahweh to bruise Him; he has put Him to grief. When You make His being an offering for sin, he shall see His seed, He shall prolong His days, and the pleasure of Yahweh shall prosper in His hand.
Hebrews 9:25-28
not that He should offer Himself often, as the high priest enters the Most Holy Place every year with blood of another--He then would have had to suffer often since the foundation of the world; but now, once at the end of the ages, He has appeared to put away sin by the sacrifice of Himself. And as it is appointed for men to die once, but after this the judgment, so Messiah was offered once to bear the sins of many. To those who eagerly wait for Him He will appear a second time, apart from sin, for salvation.
Hebrews 10:12
But this Man, after He had offered one sacrifice for sins forever, sat down at the right hand of Yahweh,
John 12:32-33
"And I, if I am lifted up from the earth, will draw all peoples to Myself." This He said, signifying by what death He would die.
1 Corinthians 15:3-4
For I delivered to you first of all that which I also received: that Messiah died for our sins according to the Scriptures, and that He was buried, and that He rose again the third day according to the Scriptures,