Exodus 13:2

13:2 “Set apart ¹  to me every firstborn male – the first offspring of every womb ²  among the Israelites, whether human or animal; it is mine.” ³ 

Exodus 21:33

21:33 “If a man opens a pit or if a man digs a pit and does not cover it, and an ox or a donkey falls into it,

[13:2]  ¹ tn The verb “sanctify” is the Piel imperative of קָדַשׁ (qadash). In the Qal stem it means “be holy, be set apart, be distinct,” and in this stem “sanctify, set apart.”

[13:2]  ² tn The word פֶּטֶּר (petter) means “that which opens”; this construction literally says, “that which opens every womb,” which means “the first offspring of every womb.” Verses 12 and 15 further indicate male offspring.

[13:2]  ³ tn Heb “to me it.” The preposition here expresses possession; the construction is simply “it [is, belongs] to me.”