- That's a hard dance you do, old man.
- We've been dancing it for 400 years to grim music.

— Moses (Charlton Heston)

11 seconds sound clip from the The Ten Commandments (1956) movie soundboard.

You can hear this line at 01:09:46.899 in the Blu-ray version of the movie.

Quote context

[...]

- From the mixing feet of treaders to the pouring hands of brick molders moves the constant stream of mud, the lowly seed of tall cities, day after day, year after year, century after century.

- Bondage without rest, toil without reward.

- These are the children of misery, the afflicted, the hopeless, the oppressed. And he went out unto his brethren, and looked on their burdens.

- Water girl!

- Here. Here's water.

- That's a hard dance you do, old man.

- We've been dancing it for 400 years to grim music.

- And the only deliverer that has come to us is death.

(whip cracking) Back to work, you braying mules.

- You're strange to the pits. Your back is unscarred.

- You bring a warm smile with your cool water.

- My smile is for a stonecutter. The water is for you.

- I thank you.

[...]