“To you in David’s town this day
Is born of David’s line
A Savior, who is Christ the Lord
And this shall be the sign …”
— from While Shepherds
Watched Their Flocks
The Messiah of Israel had to be from the tribe of Judah. Not just that, he had also to be of the specific line of David, Israel’s greatest king, and the “man after [God’s] own heart”.