Love is defined in a biblical manner in 1 Corinthians 13:1-8. There are four types/levels of love: eros, storge, philia, and agape. In Matthew 27:45-54 Jesus displayed agape (self-less) love by dying on the cross for us to be reconciled with God, the Father. Jesus and God, the Father are the same person in John 10:30. There are various demostrations of love throughout the Bible:
Gen 18:23-33 Abraham intercedes on Sodom and Gomarrah's behalf for the Most High to not destroy the two cities
Gen 29:18-28 Jacob served another seven years to marry Rachel (eros/physical attraction love)
Gen 45: 1-15 Joseph revealed himself to his brothers, who had sold him into slavery, and made a plan to preserve the Israelites.
1 Samuel 20:11-24 Jonathan makes a covenant with David to protect him from his father Saul. Jonathan loved David as his own soul.
Ester 4:16-17, 5:1-2, 7:1-10 Before appearing unannounced in the King's court to petition on behalf of Israel, Ester prayed and fasted for three days.
Ruth 1: 16-22 Ruth (Naomi's daughter in law) decides to remain with Naomi and follow the Most High until death.