² sn See G. Brin, “The Firstling of Unclean Animals,” JQR 68 (1971): 1-15.

¹ tn The Hebrew text is difficult here. We should probably read וְהַמַּשְׂמַנִּים (v^ehammasmannim, “the fat ones”) rather than the MT וְהַמִּשְׂנִים (v^ehammisnim, “the second ones”). However, if the MT is retained, the sense may be as the Jewish commentator Kimchi supposed: the second-born young, thought to be better than the firstlings. (For discussion see S. R. Driver, Notes on the Hebrew Text and the Topography of the Books of Samuel, 123-24.)

³ tn The conditional clause uses an imperfect tense; this is followed by a perfect tense with the vav consecutive providing the obligation or instruction. The owner might not redeem the donkey, but if he did not, he could not keep it, he had to kill it by breaking its neck (so either a lamb for it, or the donkey itself). The donkey could not be killed by shedding blood because that would make it a sacrifice, and that was not possible with this kind of animal. See G. Brin, “The Firstling of Unclean Animals,” JQR 68 (1977): 1-15.