What does the Bible say about calling God Father?

In Mark 14:36, Jesus calls God 'Abba, Father' during His prayer in Gethsemane. This term indicates more than mere fatherhood; it encompasses affection and tenderness akin to 'Dad' or 'Daddy'. The Old Testament portrayed God primarily as Creator and King, but through Jesus, we learn to relate to God with the fullness of fatherhood. Romans 8:15 and Galatians 4:6 reinforce this concept, stating that we are adopted as sons and can cry out to God as Father, reflecting the Spirit's work in us.