Deuteronomy 8:4

וְזָכַרְתָּ אֶת־כָּל־הַדֶּרֶךְ אֲשֶׁר הֹלִֽיכֲךָ יְהוָה אֱלֹהֶיךָ זֶה אַרְבָּעִים שָׁנָה בַּמִּדְבָּר לְמַעַן עַנֹּֽתְךָ לְנַסֹּֽתְךָ לָדַעַת אֶת־אֲשֶׁר בִּֽלְבָבְךָ הֲתִשְׁמֹר מצותו אִם־לֹֽא

And thou shalt remember all the way which the LORD thy God hath led thee these forty years in the wilderness, that He might afflict thee, to prove thee, to know what was in thy heart, whether thou wouldest keep His commandments, or no.

וַֽיְעַנְּךָ וַיַּרְעִבֶךָ וַיַּֽאֲכִֽלְךָ אֶת הַמָּן אֲשֶׁר לֹא־יָדַעְתָּ וְלֹא יָדְעוּן אֲבֹתֶיךָ לְמַעַן הוֹדִֽעֲךָ כִּי לֹא עַל־הַלֶּחֶם לְבַדּוֹ יִחְיֶה הָֽאָדָם כִּי עַל־כָּל־מוֹצָא פִֽי־יְהוָה יִחְיֶה הָאָדָֽם

And He afflicted thee, and suffered thee to hunger, and fed thee with manna, which thou knewest not, neither did thy fathers know; that He might make thee know that man doth not live by bread only, but by every thing that proceedeth out of the mouth of the LORD doth man live.

וְיָדַעְתָּ עִם־לְבָבֶךָ כִּי כַּאֲשֶׁר יְיַסֵּר אִישׁ אֶת־בְּנוֹ יְהוָה אֱלֹהֶיךָ מְיַסְּרֶֽךָּ

And thou shalt consider in thy heart, that, as a man chasteneth his son, so the LORD thy God chasteneth thee.

וְשָׁמַרְתָּ אֶת־מִצְוֺת יְהוָה אֱלֹהֶיךָ לָלֶכֶת בִּדְרָכָיו וּלְיִרְאָה אֹתֽוֹ

And thou shalt keep the commandments of the LORD thy God, to walk in His ways, and to fear Him.