Deuteronomy 8:1-3 Young's Literal Translation (YLT)
8 `All the command which I am commanding thee to-day ye observe to do, so that ye live, and have multiplied, and gone in, and possessed the land which Jehovah hath sworn to your fathers;
2 and thou hast remembered all the way which Jehovah thy God hath caused thee to go these forty years in the wilderness, in order to humble thee to try thee, to know that which [is] in thy heart, whether thou dost keep His commands or not.
3 `And He doth humble thee, and cause thee to hunger and doth cause thee to eat the manna (which thou hast not known, even thy fathers have not known), in order to cause thee to know that not by bread alone doth man live, but by every produce of the mouth of Jehovah man doth live.
Deuteronomy 8:1-3 New International Version (NIV)
Do Not Forget the Lord
8 Be careful to follow every command I am giving you today, so that you may live and increase and may enter and possess the land the Lord promised on oath to your ancestors. 2 Remember how the Lord your God led you all the way in the wilderness these forty years, to humble and test you in order to know what was in your heart, whether or not you would keep his commands. 3 He humbled you, causing you to hunger and then feeding you with manna, which neither you nor your ancestors had known, to teach you that man does not live on bread alone but on every word that comes from the mouth of the Lord.