Tafsiran Kejadian 42:16: Rashi, Kli Yakar, Or HaChaim & Radak

האמת אתכם means WHETHER THERE BE TRUTH IN YOU — therefore the ה has the vowel Patach, because it is a kind of question. And if you do not (ואם לא) bring) him חי פרעה כי מרגלים אתם BY THE LIFE OF PHARAOH, SURELY YOU ARE SPIES.

“Send one from among you.” Later he changed and sent all of them except for one, because Joseph wanted them to feel [the weight of] their sin that they committed against their brother and confess their transgression. When they would send one from among them, he thought that surely Reuben, the eldest of the brothers, would go, as the right of the firstborn entitled him to go free from the place of confinement. Perhaps the brothers would attribute [Reuben’s release] to the fact that since Reuben had no part in the sale, therefore he was saved. For even Judah had a part in this, as evidenced by the fact that the brothers lowered him from his position of leadership because of it, as Rashi explains on the verse And Judah went down (Genesis 38:1). After they were imprisoned for three days, Joseph thought that this sin had already been atoned for, therefore he sent all of them except for Simeon, because he had a greater part in his sale than all the others. For regarding what is stated They said to one another, “Come, let us kill him”, it was Simeon who said this to Levi, as Rashi explains on the verse Simeon and Levi are brothers (Genesis 49:5). Certainly Simeon was the one who began speaking thus, for Levi would not have spoken before someone older than him. And so does Rashi explain here. And all this was done so that they would recognize their sin and confess.

שלחו מכם אחד, "Despatch one of you, etc." They did not do this as they were concerned that their father would worry needlessly about the fate of all the remaining brothers.