Deuteronomy 8:12-18

otherwise, when you have eaten and are satisfied, and have built good houses and lived in them, and when your herds and flocks multiply, and your silver and gold multiply, and all that you have increases, then your heart will become lifted up [by self-conceit and arrogance] and you will forget the LORD your God who brought you from the land of Egypt, out of the house of slavery. He led you through the great and terrible wilderness, with its fiery serpents and scorpions and thirsty ground where there was no water; it was He who brought water for you out of the flinty rock. He fed you manna in the wilderness, [a substance] which your fathers did not know, so that He might humble you [by dependence on Him] and that He might test you, to do good [things] for you at the end. Otherwise, you may say in your heart, ‘My power and the strength of my hand made me this wealth.’ But you shall remember [with profound respect] the LORD your God, for it is He who is giving you power to make wealth, that He may confirm His covenant which He swore (solemnly promised) to your fathers, as it is this day.