John 6 - The Bread Of Grace

'Verily,verily, I say unto you, Moses gave you not that bread from heaven; but my Father giveth you the true bread from heaven. For the bread of God is he which cometh down from heaven and giveth life to the world.'

The bread that Moses gave to the Israelites was the Law. The Law included the ceremonial Law which was mainly to do with sacrifice. But through the moral Law the people learnt the concept of Sin, that unlike their Creator, they were not perfect.
But Christ set us free from the power of Sin by becoming our sacrifice.
Christ obeyed the Law perfectly for us who are unable to obey the Law. He loved perfectly for us, whose selfishness prohibits us from loving so much, and he suffered perfectly for us, whose suffering is marred by self-pity.

Moses brought us the Law, and the Law set the people free from the blind fear which possessed the heathen.

But it still left them with the reasonable fear of the condemnation of a just God.
Then Jesus Christ came to live among us, to suffer and die for us, to be resurrected to eternal life, the first of the children of God.
God had extended his mercy to the people. The Law came through Moses, but truth and grace came through Jesus Christ.