God's power is displayed in creation and in the many miracles recorded throughout the scripture. God's deliverance of the Israelites across the Red Sea is testified throughout the Old Testament as God's supreme Old Testament display of redemptive power in the Old Testament.
We could add Romans 1:1-7 as that "fifth-number-one", since the Person and work of Christ is shown to be the center-piece of the Gospel. As Paul carries on through Romans 1-11, we find the Lord Jesus Christ as the cause for praise. The desperation of all human beings separated from God in old Adam is contrasted with the hope believers find in Jesus - the New Adam (see Romans 5).
In Romans 9:4-5, we discover: "who are Israelites, to whom belongs the adoption as sons, and the glory and the covenants and the giving of the Law and the temple service and the promises,5 whose are the fathers, and from whom is the Christ according to the flesh, who is over all, God blessed forever. Amen."