Unless stated otherwise, my source for hymn texts and tunes is The Lutheran Service Book.
Monday, January 20, 2020
Messiah: No. 34 Unto which of the angels
The text is from Hebrews 1:5: "For to which of the angels did God ever say, 'You are my Son, today I have begotten you'? Or again, 'I will be to him a father, and he shall be to me a son'?"