Кто спит весною, плачет зимою

Не who is lazy to do his work in proper time will have nothing when in need. См. Летом дома сидеть - зимой хлеба не иметь (Л), Лето пролежишь, зимой с сумой побежишь (Л)

Cf: Не who sings in summer will weep in winter (Am.). They must hunger in frost that will not work in heat (Am., Br.). They must hunger in winter that will not work in summer (Br.)