“When they despaired of persuading him, they withdrew for private consultation. Their eldest said, ‘Do you not know that your father took from you a solemn covenant in Allah’s name, and that before this you failed with regard to Joseph? I will not leave this land until my father permits me, or Allah judges for me; and He is the best of judges.’” (80)
“When they despaired of him,” that is, they despaired of Joseph responding to their request. Abu Ubaydah said: They became certain that their brother would not be returned to them. “They withdrew for private consultation,” that is, they secluded themselves from one another, conferring and consulting together, with no one else joining them.
The term najiyy may apply to a group, as it does here, and it may apply to one person, as in His saying: “And We brought him near in private communion” (Mary 19:52). ⦗185/b⦘ It may be used for both the singular and the plural because it is a verbal noun employed adjectivally, like “justice” and “falsehood.” Similarly, najwa may be both a noun and a verbal noun. Allah Most High says: “When they are engaged in private conversation” (al-Isra 17:47), meaning, conversing privately with one another. He also says: “There is no private conversation among three” (al-Mujadilah 58:7), and, with reference to the verbal noun: “Private conversation is only from Satan” (al-Mujadilah 58:10).
“Their eldest said,” meaning, the eldest in intellect and knowledge, not in age. Ibn Abbas and al-Kalbi said: He was Judah, and he was the most intelligent of them. Mujahid said: He was Simeon, who held authority over his brothers. Qatadah, al-Suddi, and al-Dahhak said: He was Reuben, who was the oldest of them and the one who had forbidden his brothers from killing Joseph. (1)
“Do you not know that your father took from you a solemn covenant,” that is, a pledge, “in Allah’s name, and that before this you failed” in your duty “with regard to Joseph?” They differed concerning the grammatical function of ma. It was said that it is in the accusative, governed by the verb “know”; that is: Do you not know of your previous failure with regard to Joseph?