The firstlings.
The solution of the apparent discrepancy between this passage and Numbers 18:18 seems to lie in the custom of inviting the worshippers to share in the feasts provided by their offerings. View the sanctification of the firstlings as symbolical.
1. Of God's claim on the first and choicest of what we have for his own service.
2. Of God's right to redeemed life. The firstlings were redeemed by God for himself on the memorable night of the deliverance from Egypt (Exodus 13:12). God claims redeemed life as peculiarly his own (Isaiah 43:1-4; 1 Corinthians 6:20).
3. Of God's right to young life. A symbol of early consecration.
4. Of happy fellowship with God. The fellowship was a fruit of the dedication of the best.—J.O.
HOMILIES BY R.M. EDGAR