Then burst his mighty heart, and, in his mantle muffling up his face...

6 seconds sound clip from the Julius Caesar (1953) movie soundboard.

You can hear this line at 01:18:54 in the DVD version of the movie.

Quote context

[...]

- And, as he plucked his cursed steel away, mark how the blood of Caesar followed it, as rushing out of doors, to be resolved if Brutus so unkindly knocked or no.

- For Brutus, as you know, was Caesar's angel.

- Judge, O you gods, how dearly Caesar loved him!

- This was the most unkindest cut of all.

- For when the noble Caesar saw him stab, ingratitude, more strong than traitors' arms, quite vanquished him...

- Then burst his mighty heart, and, in his mantle muffling up his face...

- Even at the base of Pompey's statue, which all the while ran blood, great Caesar fell.

- O, what a fall was there, my countrymen!

- Then I, and you, and all of us fell down, whilst bloody treason flourished over us.

- Oh. Now you weep.

[...]