'First born' in the Bible

By faith Abraham, when he was tried, offered up Isaac: even his first-born, did he that had received the promises, offer up,

of which first-born it was said: In Isaac shall your posterity be called:

By faith he kept the passover, and the affusion of blood, that he who destroyed the first-born might not touch them.

to the general assembly and church of the first-born, who are enrolled in heaven, and to God, the judge of all, and to the spirits of the just made perfect,