Mitch Chase notes that Gabriel is mentioned in just two books of the Bible: Daniel 8:16; 9:21 and Luke 1:19,26.

In the Daniel passages, Gabriel makes known events that were to occur in the distant future.

In the Luke passages, Gabriel makes known near-future events.  A son is to be born to Zechariah and also to Mary.

There are a number of points of comparison.  Looking first at Daniel and Zechariah:

• The Jerusalem temple.  In Dan 8:11-14, Daniel learned that something would happen to the temple.  In Lk 1:8f, Zechariah’s encounter took place in the temple.
• Both Daniel and Zechariah were fearful when they saw Gabriel, Dan 8:17; Lk 1:12.
• Daniel learns about a future figure who will bring trouble to many, Dan 8:24f.  Zechariah learns about a figure who will bring joy to many, Lk 1:14ff.
• Both Daniel and Zechariah experienced bodily effects.  Daniel was overcome and was sick for some days, Dan 8:27.  Zechariah could not speak, Lk 1:22.

Turning now to Daniel and Mary.

• Gabriel speaks of the Lord’s regard for Daniel (Dan 9:23) and for Mary (Lk 1:28,30).
• Gabriel speaks to both Daniel (Dan 9:25f) and Mary (Lk 1:32f) about a future King.

Conclusion

In Daniel, Gabriel prophesied the Messiah; in Luke he announced the fulfilment of the prophecy and announced the Messiah’s name as ‘Jesus’.