From the early-Tang poet
刘希夷 in 《
代悲白头翁》:
年年岁岁花相似,岁岁年年人不同 (year upon year the flowers look alike; year upon year the people differ). A traditional tale says his uncle
宋之问 killed him to steal this couplet, likely apocryphal but a sign of how prized these lines were.