《太平广记·卷十六·神仙十六》
杜子春回到家后，非常悔恨他当初忘了对仙师发的誓，想回去找到仙师为他效力以补偿自己的过失。
子春既归，愧其忘誓，复自效以谢其过。
After returning home, Du Zichun deeply regretted that he forgot to fulfill the vow he made to the celestial master. He wanted to go back to find the celestial master to compensate for his mistake by serving him. 