For he said... — The words throw us back to the starting-point of God’s covenant with His people, based, so to speak, on the assumption that they would not fail utterly in the fulfilment of their promises. (Comp. Exodus 19:3-6.)
Related Commentaries of Isaiah 63:8
Isaiah 63:8
8 For he said, Surely they are my people, children that will not lie: so he was their Saviour.