The Sūtra of the Wheel of Dharma
The Sūtra of the Wheel of Dharma (Skt. Dharmacakrasūtra, Tib. ཆོས་ཀྱི་འཁོར་ལོའི་མདོ་, chö kyi khorlö do, Wyl. chos kyi ’khor lo’i mdo) is found in the General Sūtra (mdo sde) section of the Tibetan Kangyur (Toh 337).
According to all of the Buddhist traditions, this sūtra is the first teaching the Buddha gave, "turning the wheel of dharma" to explain his awakened insight to others. Here, the Buddha explains the four noble truths to his five former spiritual companions.