Thou shouldest not have looked with secret joy and satisfaction to thy eyes and mind; if thou wouldst have looked, it should have been with tears and grief, not with joy and gladness at the sight: so the word, Psa 37 Psa 44:7 Pro_29:16.
On the day; on the affliction and sad misery which fell upon thy brother Jacob; so day in Scripture, thus absolutely put, doth often signify, Psa_37:13Mic_7:4.
Became a stranger; having by the misery of war been made a captive, and lost his former right and liberty in his own country, was now looked upon as a stranger, i.e. one who had no more right to any thing in the land.
Neither shouldest thou have rejoiced: this explains the former.
Children of Judah: this expounds brother.
The day of their destruction: this tells us what day meant.
Neither shouldest thou have spoken proudly, vaunting over the Jews, insolently upbraiding and reproaching them with virulent words and exulcerated malice,