Deut 8:2-4, Mt 4:4, Jn 6:49-51, 58
In the Old Testament, God protected the Israelites from Egypt and stayed with them for 40 years in the wilderness, making them aware of the coming Christ. (Deuteronomy 2:7, Deuteronomy 8:2-4)
Deuteronomy 2:7 For the Lord thy God hath blessed thee in all the works of thy hand: he knoweth thy walking through this great wilderness: these forty years the Lord thy God hath been with thee; thou hast lacked nothing.
Deuteronomy 8:2 And thou shalt remember all the way which the Lord thy God led thee these forty years in the wilderness, to humble thee, and to prove thee, to know what was in thine heart, whether thou wouldest keep his commandments, or no. 3 And he humbled 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 word that proceedeth out of the mouth of the Lord doth man live. 4 Thy raiment waxed not old upon thee, neither did thy foot swell, these forty years.
Christ led the Israelites out of Egypt and led them in the wilderness for 40 years. (1 Corinthians 10:1-4)
1 Corinthians 10:1 Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea; 2 And were all baptized unto Moses in the cloud and in the sea; 3 And did all eat the same spiritual meat; 4 And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ.
Just as we eat bread every day, we must come to know Christ every day. (John 6:49-51, 58)
John 6:49 Your fathers did eat manna in the wilderness, and are dead. 50 This is the bread which cometh down from heaven, that a man may eat thereof, and not die. 51 I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world. 58 This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eateth of this bread shall live for ever.