Jeremiah 3:19 & 20
"'I myself said, "How gladly would I treat you like sons and give you a desirable land, the most beautiful inheritance of any nation." I thought you would call me "Father" and not turn away from following me. But like a woman unfaithful to her husband, so you have been unfaithful to me, O house of Israel,' declares the Lord." NIV translation
Throughout the Old Testament, individuals never heard that they would call God their "Father" as they were treated collectively as a nation of God. Here, God says that, He was ready to have them call Him "Father" and to treat them like sons. But, like a woman who cheats on her husband, they have turned to other gods. This promise is for us today through Jesus Christ as He made the way for us to be children of God. As God told Israel, He wants to treat us like His children and He has given us the most beautiful of inheritance (for more details, check out Revelation 21).