Isaac," meaning: upon Abraham and Isaac. "And among their descendants," meaning: the descendants of Abraham and Isaac, "is one who does good," meaning: a monotheist, that is, a believer, "and one who is clearly unjust to himself," meaning: a polytheist, "clearly" evident in his polytheism.

Exegesis of verses from 114 to 122 of Surah as-Saffat