Matthew 20:22

But Jesus answered, "You do not know what you are asking for. Are you able to drink the cup that I am about to drink?" They said to him, "We are able."

Mark 10:38

But Jesus said to them, "You do not know what you are asking. Can you drink the cup that I drink, or be baptized with the baptism I am baptized with?"

James 4:3

You ask and do not receive, because you ask with wrong motives, so that you may spend it on your pleasures.

Treasury of Scripture Knowledge

Summary

And king Solomon answered and said unto his mother, And why dost thou ask Abishag the Shunammite for Adonijah? ask for him the kingdom also; for he is mine elder brother; even for him, and for Abiathar the priest, and for Joab the son of Zeruiah.

Bible References

Why dost

Matthew 20:22
But Jesus answered, "You do not know what you are asking for. Are you able to drink the cup that I am about to drink?" They said to him, "We are able."
Mark 10:38
But Jesus said to them, "You do not know what you are asking. Can you drink the cup that I drink, or be baptized with the baptism I am baptized with?"
James 4:3
You ask and do not receive, because you ask with wrong motives, so that you may spend it on your pleasures.