The answer is: Angels

Luke 2:13-14 - It is interesting to note that the angels 'said' and did not sing as we are led to believe by many of our popular hymns.

The announcement of Jesus' birth by the angels is one of the most famous scenes in the Biblical narrative. As these celestial beings made their proclamation of “Glory to God in the highest,” they were essentially announcing the arrival of a new chapter in divine history—a theme that reverberates through the scriptures like a chorus of hope. It’s captivating to think that this message, echoing peace and goodwill, first reached humble shepherds in a field, hinting that the divine is often found in the most unexpected places.

Another fascinating layer to this story is the shepherds themselves—considered lowly in society, they were among the first witnesses to Christ's birth. This highlights a profound truth: throughout the Bible, there's a trend of God choosing the overlooked and marginalized for great purposes. This is reminiscent of other Biblical figures like Moses and David, who were also improbable heroes chosen for monumental tasks.

Moreover, the phrase "peace on earth" was particularly revolutionary. At the time of Jesus’ birth, the Roman Empire dominated, spreading peace through force. The angel's message invited an alternative vision of peace that runs deeper than mere absence of conflict—it promises goodwill and harmony. It beckons all of us to partake in a collective journey of reconciliation, a theme that can resonate across ages and borders, centering around mutual respect and harmony in our everyday lives.