2. I have loved you--above other men; nay, even above the other descendants of Abraham and Isaac. Such gratuitous love on My part called for love on yours. But the return ye make is sin and dishonor to Me. This which is to be supplied is left unexpressed, sorrow as it were breaking off the sentence [MENOCHIUS], (De 7:8; Ho 11:1).
      Wherein hast thou loved us?--In painful contrast to the tearful tenderness of God's love stands their insolent challenge. The root of their sin was insensibility to God's love, and to their own wickedness. Having had prosperity taken from them, they imply they have no tokens of God's love; they look at what God had taken, not at what God had left. God's love is often least acknowledged where it is most manifested. We must not infer God does not love us because He afflicts us. Men, instead of referring their sufferings to their proper cause, their own sin, impiously accuse God of indifference to their welfare [MOORE]. Thus Mal 1:1-4 form a fit introduction to the whole prophecy.
      Was not Esau Jacob's brother?--and so, as far as dignity went, as much entitled to God's favor as Jacob. My adoption of Jacob, therefore, was altogether by gratuitous favor (Ro 9:13). So God has passed by our elder brethren, the angels who kept not their first estate, and yet He has provided salvation for man. The perpetual rejection of the fallen angels, like the perpetual desolations of Edom, attests God's severity to the lost, and goodness to those gratuitously saved. The sovereign eternal purpose of God is the only ground on which He bestows on one favors withheld from another. There are difficulties in referring salvation to the election of God, there are greater in referring it to the election of man [MOORE]. Jehovah illustrates His condescension and patience in arguing the case with them.

JFB.