Genesis 27:2

Isaac said, “See here, I am old; I do not know when I may die.

Genesis 47:29

And when the time drew near for Israel to die, he called his son Joseph and said to him, “If now I have found favor in your sight, please put your hand under my thigh and [promise to] deal loyally and faithfully with me. Please do not bury me in Egypt,

Genesis 48:21

Then Israel said to Joseph, “Behold, I am about to die, but God will be with you, and bring you back to [Canaan] the land of your fathers.

1 Samuel 20:3

But David vowed again, saying “Your father certainly knows that I have found favor in your sight, and he has said, ‘Do not let Jonathan know this, or he will be worried.’ But truly as the Lord lives and as your soul lives, there is hardly a step between me and death.”

Proverbs 27:1

Do not boast about tomorrow,
For you do not know what a day may bring.

Ecclesiastes 9:10

Whatever your hand finds to do, do it with all your might; for there is no activity or planning or knowledge or wisdom in Sheol (the nether world, the place of the dead) where you are going.

Isaiah 38:1

In those days Hezekiah [king of Judah] became sick and was at the point of death. And Isaiah the prophet, the son of Amoz, came to him and said, “For the Lord says this, ‘Set your house in order and prepare a will, for you shall die; you will not live.’”

Isaiah 38:3

and said, “Please, O Lord, just remember how I have walked before You in faithfulness and truth, and with a whole heart [absolutely devoted to You], and have done what is good in Your sight.” And Hezekiah wept greatly.

Mark 13:35

Therefore, be continually on the alert—for you do not know when the master of the house is coming, whether in the evening, or at midnight, or when the rooster crows, or in the morning—

James 4:14

Yet you do not know [the least thing] about what may happen in your life tomorrow. [What is secure in your life?] You are merely a vapor [like a puff of smoke or a wisp of steam from a cooking pot] that is visible for a little while and then vanishes [into thin air].

Treasury of Scripture Knowledge

Summary

And he said, Behold now, I am old, I know not the day of my death:

General references

Bible References

I know not

Genesis 48:21
Then Israel said to Joseph, “Behold, I am about to die, but God will be with you, and bring you back to [Canaan] the land of your fathers.
1 Samuel 20:3
But David vowed again, saying “Your father certainly knows that I have found favor in your sight, and he has said, ‘Do not let Jonathan know this, or he will be worried.’ But truly as the Lord lives and as your soul lives, there is hardly a step between me and death.”
Proverbs 27:1
Do not boast about tomorrow,
For you do not know what a day may bring.
Ecclesiastes 9:10
Whatever your hand finds to do, do it with all your might; for there is no activity or planning or knowledge or wisdom in Sheol (the nether world, the place of the dead) where you are going.
Isaiah 38:1
In those days Hezekiah [king of Judah] became sick and was at the point of death. And Isaiah the prophet, the son of Amoz, came to him and said, “For the Lord says this, ‘Set your house in order and prepare a will, for you shall die; you will not live.’”
Mark 13:35
Therefore, be continually on the alert—for you do not know when the master of the house is coming, whether in the evening, or at midnight, or when the rooster crows, or in the morning—
James 4:14
Yet you do not know [the least thing] about what may happen in your life tomorrow. [What is secure in your life?] You are merely a vapor [like a puff of smoke or a wisp of steam from a cooking pot] that is visible for a little while and then vanishes [into thin air].

General references

Romans 9:16
So then God’s choice is not dependent on human will, nor on human effort [the totality of human striving], but on God who shows mercy [to whomever He chooses—it is His sovereign gift].