And rend your heart, and not your garments, and turn unto the Lord your God. Where there is real contrition of spirit because of sin, outward manifestations are both suitable and proper, though not by way of display or for sake of ostentation.
But they were reminded, on the other hand, that mere outward manifestations avail nothing unless there also exist the deep inward feelings which are in harmony with and naturally underlie those manifestations.
Out of such inward feelings those outward expressions properly originate; hence, after the exhortation to fasting and weeping and mourning, it is added, "Rend your heart, and not your garments." To rend the garments, among the Jews, was a token of great grief, and imported that the individual who did so was overwhelmed with excessive sorrow, or had encountered some terrible calamity.
Thus we read of Jacob, on receiving his son Joseph's coat of many colours, rending his clothes, putting sackcloth on his loins, and mourning for his son many days (comp. also 2 Chronicles 34:27). In these instances the sorrow was deep and genuine and bitter.
It was possible, however, to exhibit the external signs of grief without any such corresponding inward feeling of sorrow; just as it is still possible for men to draw near to God with their lips while the heart is far from him.
To prevent such hypocritical pretence they are commanded to rend their hearts, and not their garments only. There was no impropriety in rending their garments in token of great grief for sin and of great indignation against themselves for their folly, but the command imports that they were not to rest in the outward sign without the reality of the thing signified.
For he is gracious and merciful, slow to anger, and of great kindness, and repenteth him of the evil. To the exhortation he subjoins the encouraging manifestation of the Divine character with which God, ages before, had favoured Moses, substituting for "truth" the trait of character best suited to the present emergency.
tie is not an absolute God or an inexorable God, but their covenant God and Father who invites them even to himself, against whom they had so heinously sinned and whom they had so grievously offended.