얼굴을 들라(고 하는) 소리에
In the word that I/he/she have to lift my/his/her face,
~아/어라 is added to make a command.
들다 -> 들어라
When quoting commands, you must attach ~(으)라고 to the stem of the verb.
들다 -> 들라고
얼굴을 들다 means "lift one's face"
나는 얼굴을 들었다 means "I lifted my face"
(네) 얼굴을 들어라 means "Lift your face!"
그가 말했다, "얼굴을 들어라" means "He said, "Lift your face!"
얼굴을 들라고 그가 말했다. means "He said that I have to lift my face".