What is the classic oath that Wei Zi and Erkang said in Princess Zhu Huan?

Wei Zi, you are always the best in my heart. No one can compare with you. There is no sunny day, nothing. I, Fu Erkang, swear to God that I will never fail Xia Ziwei in my life. If I break this oath, neither heaven nor earth will tolerate it. Wei Zi, let's go to see the emperor now. I'll beg him to give you to me. I will never kneel down until the emperor agrees.