All that openeth the matrix is mine,.... Or "the womb", and therefore to be sanctified, and set apart for his use: this also was declared, and the law concerning it given, at the time of their coming out of Egypt, and here repeated; see Gill on Exo 13:2, Exo 13:12. . Exodus 34:20 exo 34:20 exo 34:20 exo 34:20Every firstling of an ass thou shalt redeem,.... This goes along with the former; see Gill on Exo 13:13, and none shall appear before me empty; at the grand festivals, the passover, pentecost, and tabernacles; see Gill on Exo 13:15.