Midrasz do Powtórzonego Prawa 24:7

(Exodus 21:16) "And one who steals a man and sells him": What is the intent of this? From (Devarim 24:7) "If a man be found (by witnesses) to have stolen a soul of his brothers, etc." I know only of (the necessity for) witnesses to the stealing. Whence do I derive (the same for) witnesses to the selling? From "And one who steals a man and sells him."

When Yosef came up to his brothers, they stripped Yosef of his tunic, the colorful tunic that was on him" (Genesis 37:23) Rabbi Elezar said: he [Yosef] came mocking them. "And they stripped Yosef" - this is when they took his traveling cloak. "His tunic" this is [them stripping off] his shirt. "The colorful tunic" this is the tunic itself. "That was on him" this is his breeches. "And they seized him" we read they seized him, but the word can be read as "he seized him" and who was that? Shimeon. When did Yosef pay him back for this? After: "And he took Shimeon from them". "And they tossed him in the pit, and the pit was empty, there was no water in it" - No water in it, but there were snakes and scorpions. There were two pits [in the area] one filled with stones and another with fiery snakes and scorpions. Rav Acha said: the pit was empty - Yaakov's pit emptied. There was no water in it - there were no words of Torah, that are compared metaphorically to water, such as you say "Oy, all who are thirsty come to water" (Isaiah 55:1). It is written "when a man is found stealing a person from his brothers" (Deut. 24:7) and here you are, selling your brother.

(Devarim 24:7) "If there be found": by witnesses;