So much for the antique Christmas Carol from Austria/Germany/Central Europe.

Now, Lope de Vega. The Spanish quoted in the opening post
is from a "villancico" within a longer work
written for Navidad/Christmas.
Before submitting Lope de Vega's actual Spanish text,
this link goes to a recording
of an actor reading the Spanish words.

La niña a quien dijo el Ángel . . . Pues andáis en las palmas, ángeles santos