Final answer:
The first-born of Israel, according to Exodus 6:14, was Reuben. Reuben was the oldest son of Jacob and Leah.
Step-by-step explanation:
The first-born of Israel, according to Exodus 6:14, was Reuben. Reuben was the oldest son of Jacob (also known as Israel) and Leah. In the Bible, Jacob had twelve sons who became the heads of the twelve tribes of Israel, and Reuben was the firstborn among them.