Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why

firstling

adjective
First produced; as firstling males. Deuteronomy 15:19.

firstling

noun
The first produce or offspring; applied to beasts; as the firstlings of cattle.

firstling

The thing first thought or done. The very firstlings of my heart shall be the firstlings of my hand.