God also made a promise with an oath (a solemn promise), see Hebrews 7:20–22. This oath shows that God will never change his mind because it is impossible for God to lie (see Psalm 110:4).
We who have fled to take hold of the hope set before us, similiar to people in the Old Testament who accidentally killed someone and sought refuge (Numbers 35:9–34; Deuteronomy 4:41–43). Christ is like a city of refuge, where believers find safety from God's anger. Because of this, Christ's followers have great confidence.