Bekhor. (Hebrew: first-born) God commanded Moses: “Consecrate to me all the first-born; whatever is first to open the womb among the people of Israel, both of man and of beast, is mine” Ex 13:2. During the Old Testament days, this meant in particular the first-born male of a Hebrew mother. But also, Israel celebrated the Passover using bekhor flour to make the matzah, and bekhor fruit to make the wine.
Israel’s feast shavuot (weeks) is also called bikurim (first-born) because Jews celebrate it seven weeks after the second day of pesakh.
These bikurim (plural) prepared us for Rabbi Yeshua. “And she gave birth to her first-born [bekhor] son and wrapped him in swaddling cloths, and laid him in a manger” Lk 2:7. “For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the first-born [bekhor] among many brethren” Rom 8:29. “He is the image of the invisible God, the first-born [bekhor] of all creation” Col 1:15. “He is the head of the body, the church; he is the beginning, the first-born [bekhor] from the dead, that in everything he might be pre-eminent” Col 1:18.