'First born' in the Bible

He struck down all the firstborn in Egypt, the firstfruits of their reproductive power in the tents of Ham.

I will appoint him to be my firstborn son, the most exalted of the earth's kings.

He struck down all the firstborn in their land, the firstfruits of their reproductive power.

He struck down the firstborn of Egypt, including both men and animals.

to the one who struck down the firstborn of Egypt, for his loyal love endures,