Passage: According to Huineng's autobiography in the Platform Sutra, Huineng's father was from Fanyang, but he was banished from his government position and passed away at a young age. Huineng and his mother were left in poverty and moved to Nanhai, where Huineng sold firewood to support his family. One day, Huineng delivered firewood to a customer's shop, where he met a man reciting the Diamond Sutra. 'On hearing the words of the scripture, my mind opened up and I understood.' He inquired about the reason that the Diamond Sutra was chanted, and the person stated that he came from the Eastern Meditation Monastery in Huangmei District of the province of Qi, where the Fifth Patriarch of Chan lived and delivered his teachings. Huineng's customer paid his ten silver taels and suggested that he meet the Fifth Patriarch of Chan.

Question: What did Huineng delivered?
firewood