“The story told by the Old Testament is that of the glory of God, who reveals himself to be both merciful and just, righteous and forgiving.
The story began in the garden, where our first father was judged and shown mercy. It continued with God’s choice of and promise to Abraham, his deliverance of Israel from Egypt, and his long patience with the wayward nation. God’s justice finally fell when the nation was exiled, and all the cruelty of the destruction of Israel and Judah points to the incalculable worth of the God who would exact such punishment.
The Old Testament is a forward-looking book. It ends with the demonstration of God’s faithfulness to the promises he has made to his people. It also ends with the frank acknowledgment that not all the promises have been realized, and those with eyes of faith strain to glimpse their fulfillment.
…The story of the Old Testament is a story that leads its readers to think high thoughts of the Lord Yahweh, to glorify him. And the reason we are led to glorify him is that we see his justice and his mercy, which he makes to kiss each other (Ps. 85:11). When the story continues with the coming of the baptizing prophet, there will be more salvation that comes through more judgment, and this will only lead to more praise for the one who is worthy.”
(Hamilton Jr., James M. God’s Glory in Salvation through Judgment: A Biblical Theology)