曾说海枯石烂天荒地老不离
[céng shuō hăi kū shí làn tiān huāng dì lăo bù lí]
Direct translation would be ‘Once said never apart till the end of time’. This phrase indicates a strong, perhaps romantic relationship, or wish. “Till the seas run dry and the rocks crumble” is similar to saying 'till death do us part'.