Would a barbarian’s rage end if on the first round of combat he does not make an attack?

@JeremyECrawford Would a barbarian's rage end if on the first round of combat he does not make an attack? or would it end on the next turn?

— Joshua Sowers (@SowersJoshua) February 6, 2016

At the end of a barbarian's 1st turn, Rage ends if the barb. hasn't attacked a foe or taken damage this round. #DnD https://t.co/SkeEFDezsj

— Jeremy Crawford (@JeremyECrawford) February 18, 2016

To keep Rage going, a barbarian's attack against an enemy doesn't need to hit. #DnD https://t.co/50fHoSZ5xn

— Jeremy Crawford (@JeremyECrawford) February 18, 2016