By the life.

Genesis 42:7, 12, 16, 30
When Joseph saw his brothers, he recognized them, but he treated them as strangers and spoke harshly to them. "Where have you come from?" he asked. "From the land of Canaan, " they replied. "We are here to buy food." . . .

Deuteronomy 6:13
Fear the LORD your God, serve Him, and take your oaths using only His name.

1 Samuel 1:26
"Please, my lord, " said Hannah, "as surely as you live, my lord, I am the woman who stood here beside you praying to the LORD.

1 Samuel 17:55
As Saul had watched David going out to confront the Philistine, he said to Abner the commander of the army, "Abner, whose son is this young man?" "As surely as you live, O king, " Abner replied, "I do not know."

1 Samuel 20:3
But David again vowed, "Your father knows very well that I have found favor in your eyes, and he has said, 'Jonathan must not know of this, or he will be grieved.' As surely as the LORD lives and as you yourself live, there is but a step between me and death."

Jeremiah 5:2, 7
Although they say, "As surely as the LORD lives, " they are swearing falsely. . . .

Matthew 5:33-37
Again, you have heard that it was said to the ancients, 'Do not break your oath, but fulfill your vows to the Lord.' . . .

Matthew 23:16-22
Woe to you, blind guides! You say, 'If anyone swears by the temple, it means nothing; but if anyone swears by the gold of the temple, he is bound by his oath.' . . .

James 5:12
Above all, my brothers, do not swear, not by heaven or earth or by any other oath. Simply let your "Yes" be yes, and your "No, " no, so that you will not fall under judgment.

except.

Genesis 42:20, 34
Then bring your youngest brother to me so that your words can be verified, that you may not die." And to this they consented. . . .

Genesis 43:3
But Judah replied, "The man solemnly warned us, 'You will not see my face again unless your brother is with you.'

Genesis 44:20-34
And we answered, 'We have an elderly father and a younger brother, the child of his old age. The boy's brother is dead. He is the only one of his mother's sons left, and his father loves him.' . . .