He hath holpen [supported, αντελαβετο ] his servant Israel - Israel is here represented as falling, and the Lord comes speedily in and props him up. The house of David was now ready to fall and rise no more; Jesus, being born of the very last branch of the regal line, revived the family, and restored the dominion.
In remembrance of his mercy - By mercy, the covenant which God made with Abraham, Genesis 15:18, is intended; which covenant proceeded from God's eternal mercy, as in it salvation was promised to all the nations of the earth. See Genesis 17:19, and Genesis 22:18, and this promise was, in one form or other, given to all the fathers, Luke 1:55.
This song properly consists of three parts.
3. In the third, she praises him for what he had done, and would do, for his Church, Luke 1:53-56.
Hath holpen - Hath helped or assisted. The word rendered “holpen” denotes properly, “to take hold of one, to help him up when he is in danger of falling,” and here means that God had succored his people when they were feeble, and were in danger of falling or being overthrown.
In remembrance of his mercy - Or that His mercy may be remembered.