Luke 1:72

Let us not suppose that this refers to our bodily enemies, but our ghostly. For the Lord Jesus came mighty in battle (Ps. 24:8) to destroy all our enemies, that He might deliver us from their snares and temptation.

Having announced that the Lord, according to the declaration of the Prophet, would be born of the house of David, he now says, that the same Lord to fulfil the covenant He made with Abraham will deliver us, because chiefly to these patriarchs of Abraham's seed was promised the gathering of the Gentiles, or the incarnation of Christ. But David is put first, because to Abraham was promised the holy assembly of the Church; whereas to David it was told that from him Christ was to be born. And therefore after what was said of David, he adds concerning Abraham the words, To perform the mercy promised to our fathers, &c.

The grace of Christ extends even to those who are dead, because through Him we shall rise again, not only we, but they also who have been dead before us. He performed His mercy also to our forefathers in fulfilling all their hopes and desires. Hence it follows, And to remember his holy covenant, that covenant, namely, wherein he said, Blessing, I will bless thee, and multiplying, I will multiply thee. (Gen. 22:17.) For Abraham was multiplied in all nations, who became his children by adoption, through following the example of his faith. But the fathers also, seeing their children enjoy these blessings, rejoice together with them, just as if they received the mercy in themselves. Hence it follows, The oath which he sware to our father Abraham, that he would grant unto us.