The interpretation timeline
Genesis 46:27 Douay-Rheims

And the sons of Joseph, that were born to him in the land of Egypt, two souls. All the souls of the house of Jacob, that entered into Egypt, were seventy.

A.D. 407 – 1771 2 witnesses

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Why did sacred Scripture indicate the number to us precisely? So that we might be in a position to know how God's prediction took effect that said, "I will make you into a great nation there." You see, from those seventy-five persons the people of Israel grew into six hundred thousand. You notice how it was not idly or to no purpose that it taught us the number of those that went down to Egypt, but for us to know from how few that great number came and not to lose confidence in God's promises. I mean, when you consider that after the death of Jacob and Joseph the king of the Egyptians went to such lengths to reduce their numbers and prevent them from growing, be amazed and overcome at God's providence and the fact that his wishes can never fail, no matter how many people try their utmost.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And Joseph said unto his brethren, and to his father's house,.... To them and their families, after he had paid his filial respects to his father, in honour, reverence, and affection: I will go up and shew Pharaoh; acquaint him that his father and all his family were come to Egypt; he says, "I will go up"; which same phrase is used of him, Gen 46:29; when he came, and carries some difficulty in it how to account for it, that he should be said to go up when he came, and to go up when he returned. Some have thought of upper Egypt, others of the upper part of the Nile, and others, that Pharaoh's palace was situated on an eminence; but then, as it is to be supposed he went the same road he came, it would have been said, that when he came, he came down; what Ben Melech suggests seems most agreeable, I will go up to my chariot, mount that, and return to Pharaoh, and give him an account of his father's arrival, which it was very proper, prudent, and politic to do: and say unto him, my brethren, and my father's house, which were in the land of Canaan, are come unto me; not merely to pay him a visit, but to continue there.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.