From Du Shenyan's (
杜审言, Tang)
《春日京中有怀》, whose closing couplet runs
寄语洛城风日道,明年春色倍还人. Du Shenyan, grandfather of the poet
杜甫, wrote it pining for Luoyang while stranded in Chang'an. Classical commentators read
还 as 'huán' (to repay, return), not 'hái.'