Genesis 42:2
And he said, Behold, I have heard that there is corn in Egypt: get you down thither, and buy for us from thence; that we may live, and not die.
Cross-reference
Genesis 42:1 shows Jacob hearing about grain in Egypt, leading directly to his command in verse 2.
Genesis 42:19 continues the story: Joseph sends brothers back with grain but holds Simeon, fulfilling the initial command.
Genesis 43:2 records Jacob's second command to buy grain, directly following from the first in Genesis 42:2.
Genesis 43:4 is Judah's response to Jacob — conditional on sending Benjamin, linked to the initial command.
Genesis 43:8 repeats Jacob's reasoning 'that we may live, and not die' as Judah persuades him to send Benjamin.
Genesis 45:9 fulfills Jacob's command: Joseph invites the family to come down to Egypt, the very destination for grain.
Genesis 41:54 establishes the worldwide famine that motivates Jacob's command to buy grain in Egypt.