Genesis 43:32

So the servants served Joseph by himself [in honor of his rank], and his brothers by themselves, and the Egyptians who ate with him by themselves, because [according to custom] the Egyptians could not eat food with the Hebrews, for that is loathsome to the Egyptians.

Genesis 46:34

you shall say, ‘Your servants have been keepers of livestock from our youth until now, both we and our fathers [before us],’ in order that you may live [separately and securely] in the land of Goshen; for every shepherd is repulsive to the Egyptians.”

Exodus 8:26

But Moses said, “It is not right [or even possible] to do that, for we will sacrifice to the Lord our God what is repulsive and unacceptable to the Egyptians [that is, animals that the Egyptians consider sacred]. If we sacrifice what is repulsive and unacceptable to the Egyptians, will they not riot and stone us?

Genesis 31:54

Then Jacob offered a sacrifice [to the Lord] on the mountain, and called his relatives to the meal; and they ate food and spent the night on the mountain.

Genesis 43:16

When Joseph saw Benjamin with them, he said to the steward of his house, “Bring the men into the house, and kill an animal and make [a meal] ready; for the men will dine with me at noon.”

Treasury of Scripture Knowledge

Summary

And they set on for him by himself, and for them by themselves, and for the Egyptians, which did eat with him, by themselves: because the Egyptians might not eat bread with the Hebrews; for that is an abomination unto the Egyptians.

For that is an abomination

General references

Bible References

Eat bread

Genesis 43:16
When Joseph saw Benjamin with them, he said to the steward of his house, “Bring the men into the house, and kill an animal and make [a meal] ready; for the men will dine with me at noon.”
Genesis 31:54
Then Jacob offered a sacrifice [to the Lord] on the mountain, and called his relatives to the meal; and they ate food and spent the night on the mountain.

For that is an abomination

Exodus 8:26
But Moses said, “It is not right [or even possible] to do that, for we will sacrifice to the Lord our God what is repulsive and unacceptable to the Egyptians [that is, animals that the Egyptians consider sacred]. If we sacrifice what is repulsive and unacceptable to the Egyptians, will they not riot and stone us?

General references

Genesis 44:2
Put my [personal] cup, the silver cup, in the mouth of the sack of the youngest, with his grain money.” And the steward did as Joseph had told him.
Proverbs 23:1
When you sit down to dine with a ruler,
Consider carefully what is [set] before you;