For Brutus, as you know, was Caesar's angel.
5 seconds sound clip from the Julius Caesar (1953) movie soundboard.
You can hear this line at 01:18:36 in the DVD version of the movie.
Quote context
[...]
- You all do know this mantle. I remember the first time ever Caesar put it on.
- It was on a summer's evening in his tent that day he overcame the Nervii.
- Look, in this place ran Cassius' dagger through. See what a rent the envious Casca made.
- Through this the well-beloved Brutus stabbed...
- 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.
- 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.
[...]