As the Israelites suffered from being given more slave work than they could accomplish with the quota of bricks, and as they went hunrgy while their oppressors' bellies were full, God instructed Moses to go to Pharaoh and demand that the Israelites be allowed to go into the wilderness for a 3 day Dance Festival [the root meaning of "Chag" is "dance in a circle"] to Y-h-v-h (shortened by some to "Jah").

Them Belly Full (But We Hungry):  Music by Bob Marley.  Words by Rabbi Nadav Caine

Them belly full but we hungry
A hungry mob is an angry mob
Slavery, the work it tough
They give us bricks but it ain't enough

We're gonna dance to Jah music, dance
We're gonna dance to Jah music, dance
Forget your sorrows and dance
Forget your troubles and dance
Forget your sickness and dance
Forget your weakness and dance, I say

Pharaoh wants our boys to die
The Israelites they start to cry
And now the weak must get strong, they say
What a tribulation, saying
My belly full but me hungry
A hungry mob is an angry mob
Slavery, the work it tough
They give us bricks but it ain't enough
We're gonna dance to Jah music, Lord
Hey-hey, we're dancin to Jah music, we're dancin'
Ooh, my belly full but me hungry
A hungry mob is an angry mob
Slavery, the work it tough
They give us bricks but it ain't enough
Slavery (work it tough)
And all the bricks (it ain't enough)
And then hungry man (angry mob)
I say a hungry man (angry man)
Lord, a hungry mob (angry man)
And then hungry mob (angry mob)
I say a hungry mob (angry man)
(fade out whenever)