Look unto Abraham - What was figuratively expressed in the former verse is here expressed literally. They were directed to remember that God had taken Abraham and Sarah from a distant land, and that from so humble a beginning he had increased them to a great nation. The argument is, that he was able to bless and increase the exile Jews, though comparatively feeble and few.

For I called him alone - Hebrew, 'For one I called him;' that is, he was alone; there was but one, and he increased to a mighty nation. So Jerome, Quia unum vocavi eum. So the Septuagint, Ὅτι εἷς ἦν hoti heis ēn - 'For he was one.' The point of the declaration here is, that God had called one individual - Abraham - and that he had caused him to increase until a mighty nation had sprung from him, and that he had the same power to increase the little remnant that remained in Babylon until they should again become a mighty people.

I called him alone - As I have made out of one a great nation; so, although ye are brought low and minished, yet I can restore you to happiness, and greatly multiply your number.

Look unto Abraham your father,.... Not only the father of the Jewish nation, but of all them that believe: this explains what is meant by the rock, in the former verse, who is to be looked unto for imitation in the exercise of faith, and performance of duty, and for encouragement in distressed times and circumstances:

and unto Sarah that bare you; signified by the pit or cistern; who was not only the mother of the Jewish nation; but such also are her daughters who do well, and tread in her steps: now the very unpromising circumstances these two persons were in, are proposed to be considered by the church in her present ones, for the encouragement of her faith; that as a numerous issue proceeded from them, so also should she become fruitful and multiply:

for I called him alone, and blessed him, and increased him; he was without issue when he was "called" out of Chaldea into another country, and also the only one of the family; and the Lord "blessed" him not only with flocks and herds, and gold and silver, but with a son in his old age; and so "increased" him, that there sprung from him as many as the stars of the sky in multitude, and as the sand by the sea shore innumerable, Hebrews 11:12. The Septuagint and Arabic versions, between "blessed" and "increased", insert these words, "and I loved him", which are not in the Hebrew text. The Targum is,

"and one was Abraham, alone in the world, and I brought him to my service, and I blessed him, and multiplied him.''

Look unto Abraham your father, and unto Sarah that bare you: for I called him alone, and blessed him, and increased him.

51:2 Him alone - To follow me to an unknown land: him only of all his kindred. Increased - Into a vast multitude, when his condition was desperate in the eye of reason. And therefore God can as easily raise his church when they are in the most forlorn condition.

2. alone-translate, "I called him when he was but one" (Eze 33:24). The argument is: the same God who had so blessed "one" individual, as to become a mighty nation (Ge 12:1; 22:7), can also increase and bless the small remnant of Israel, both that left in the Babylonish captivity, and that left in the present and latter days (Zec 14:2); "the residue" (Isa 13:8, 9).

51:1-3 It is good for those privileged by the new birth, to consider that they were shapen in sin. This should cause low thoughts of ourselves, and high thoughts of Divine grace. It is the greatest comfort to be made serviceable to the glory of God. The more holiness men have, and the more good they do, the more gladness they have. Let us seriously reflect upon our guilt. To do so will tend to keep the heart humble, and the conscience awake and tender. They make Christ more precious to the soul, and give strength to our attempts and prayers for others.