³ sn This is a euphemism for having sexual intercourse with Jacob’s wives (see Gen 35:22).

¹ sn The phrase when he defiled his father’s bed refers to Reuben having sexual relations with his father Jacob’s concubine Bilhah. This incident is recorded in Gen 35:22.

¹ tn Heb “the nakedness of a father one uncovers within you.” The ancient versions read the verb as plural (“they uncover”). If the singular is retained, it must be taken as indefinite and representative of the entire group. The idiomatic expression “uncover the nakedness” refers here to sexual intercourse (cf. Lev 18:6). To uncover a father’s nakedness could include sexual relations with one’s own mother (Lev 18:7), but more likely it refers to having intercourse with another wife of one’s father, such as a stepmother (Lev 18:8; cf. Gen 35:22; 49:4).

¹ sn The firstborn were those that were essentially redeemed from death in Egypt when the blood was put on the doors. So in the very real sense they belonged to God (Exod 13:2,12). The firstborn was one who stood in special relationship to the father, being the successive offspring. Here, the Levites would stand in for the firstborn in that special role and special relationship. God also made it clear that the nation of Israel was his firstborn son (Exod 4:22-23), and so they stood in that relationship before all the nations. The tribe of Reuben was to have been the firstborn tribe, but in view of the presumptuous attempt to take over the leadership through pagan methods (Gen 35:22; 49:3-4), was passed over. The tribes of Levi and Simeon were also put down for their ancestors’ activities, but sanctuary service was still given to Levi.