[is] the food of the sinner," meaning the polytheist.
"The matter descends," meaning: the revelation. "Between them," [meaning] "between the heaven and the earth." "That you may know," through this revelation, "that Allah is over all things competent and that Allah has encompassed all things in knowledge," for nothing escapes His knowledge.
Muhammad said: "In knowledge" (ilman) is in the accusative case as a confirming verbal noun (masdar mu'akkad). The meaning is: He has known all things with a knowledge. This part ends with the praise of Allah.
﴿طَعَام الأثيم﴾ الْمُشرك