Thou shalt set apart — i.e., separate off from the rest of the flock or herd, that it might not be mixed up with those which were not “sanctified.”
Related Commentaries of Exodus 13:12
Exodus 13:12
12 That thou shalt set apart unto the LORD all that openeth the matrix, and every firstling that cometh of a beast which thou hast; the males shall be the LORD'S.