From Matthew 7:8-11:
[Jesus says:] For everyone who asks receives, and everyone who searches finds, and for everyone who knocks, the door will be opened. 9Is there anyone among you who, if your child asks for bread, will give a stone? 10Or if the child asks for a fish, will give a snake? 11If you then, who are evil, know how to give good gifts to your children, how much more will your Father in heaven give good things to those who ask him!